diff --git a/dwds/CHANGELOG.md b/dwds/CHANGELOG.md
index 579144f39..212894a5d 100644
--- a/dwds/CHANGELOG.md
+++ b/dwds/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 11.5.2-dev
+
+- Show an alert in the Dart Debug Extension for a multi-app scenario.
+
 ## 11.5.1
 
 - Update SDK contraint to `>=2.15.0 <3.0.0`.
@@ -18,7 +22,7 @@
 - Fix chrome detection in iPhone emulation mode in chrome or edge browsers.
 - Reliably find unused port for extension backend http service.
 - Ignore offset / count parameters in getObject if the object has no length.
-- Include static member information for classes
+- Include static member information for classes.
 
 ## 11.4.0
 
diff --git a/dwds/debug_extension/CHANGELOG.md b/dwds/debug_extension/CHANGELOG.md
index b7fea7aff..c3f94e99b 100644
--- a/dwds/debug_extension/CHANGELOG.md
+++ b/dwds/debug_extension/CHANGELOG.md
@@ -1,9 +1,12 @@
+## 1.24
+
+- Detect Dart applications in multi-app environments and show an alert.
+
 ## 1.23
 
 - Depend on the latest `package:sse` to improve stability of the connection with many
   concurrent requests. 
 
-
 ## 1.22
 
 - Detect Dart applications and update the icon accordingly.
diff --git a/dwds/debug_extension/pubspec.yaml b/dwds/debug_extension/pubspec.yaml
index 520022608..34dd9327b 100644
--- a/dwds/debug_extension/pubspec.yaml
+++ b/dwds/debug_extension/pubspec.yaml
@@ -1,6 +1,6 @@
 name: extension
 publish_to: none
-version: 1.23.0
+version: 1.24.0
 author: Dart Team <misc@dartlang.org>
 homepage: https://github.com/dart-lang/webdev
 description: >-
diff --git a/dwds/debug_extension/web/background.dart b/dwds/debug_extension/web/background.dart
index 23b17708a..bdd060c90 100644
--- a/dwds/debug_extension/web/background.dart
+++ b/dwds/debug_extension/web/background.dart
@@ -38,6 +38,9 @@ const _allowedEvents = {'Overlay.inspectNodeRequested'};
 // Map of Chrome tab ID to encoded vm service protocol URI.
 final _tabIdToEncodedUri = <int, String>{};
 
+// Map of Chrome tab ID to warnings for that tab.
+final _tabIdToWarning = <int, String>{};
+
 final _debuggableTabs = <int>{};
 
 final _tabsToAttach = <Tab>{};
@@ -67,6 +70,12 @@ void main() {
     var callback = allowInterop((List<Tab> tabs) async {
       currentTab = tabs[0];
       if (!_debuggableTabs.contains(currentTab.id)) return;
+
+      if (_tabIdToWarning.containsKey(currentTab.id)) {
+        alert(_tabIdToWarning[currentTab.id]);
+        return;
+      }
+
       attach(Debuggee(tabId: currentTab.id), '1.3', allowInterop(() async {
         if (lastError != null) {
           String alertMessage;
@@ -100,6 +109,10 @@ void main() {
 
   onMessageAddListener(allowInterop(
       (Request request, Sender sender, Function sendResponse) async {
+    // Register any warnings for the tab:
+    if (request.warning != '') {
+      _tabIdToWarning[sender.tab.id] = request.warning;
+    }
     _debuggableTabs.add(sender.tab.id);
     _updateIcon();
     // TODO(grouma) - We can conditionally auto start debugging here.
@@ -362,9 +375,20 @@ void _updateIcon() {
   var query = QueryInfo(active: true, currentWindow: true);
   queryTabs(query, allowInterop((List tabs) {
     var tabList = List<Tab>.from(tabs);
-    if (tabList.isEmpty || _debuggableTabs.contains(tabList.first.id)) {
+    // If tabList is empty, the user has likely navigated to a different window.
+    // Therefore, do not update the icon:
+    if (tabList.isEmpty || tabList.first == null || tabList.first.id == null) {
+      return;
+    }
+
+    if (_tabIdToWarning.containsKey(tabList.first.id)) {
+      // Set the warning icon (red):
+      setIcon(IconInfo(path: 'dart_warning.png'));
+    } else if (_debuggableTabs.contains(tabList.first.id)) {
+      // Set the debuggable icon (blue):
       setIcon(IconInfo(path: 'dart.png'));
     } else {
+      // Set the default icon (grey):
       setIcon(IconInfo(path: 'dart_grey.png'));
     }
   }));
@@ -514,6 +538,7 @@ class Request {
   external int get tabId;
   external String get name;
   external dynamic get options;
+  external String get warning;
   external factory Request({int tabId, String name, dynamic options});
 }
 
diff --git a/dwds/debug_extension/web/background.js b/dwds/debug_extension/web/background.js
index 84fc2d827..e80120ccb 100644
--- a/dwds/debug_extension/web/background.js
+++ b/dwds/debug_extension/web/background.js
@@ -1,8 +1,8 @@
 (function dartProgram(){function copyProperties(a,b){var s=Object.keys(a)
 for(var r=0;r<s.length;r++){var q=s[r]
-b[q]=a[q]}}function mixinProperties(a,b){var s=Object.keys(a)
+b[q]=a[q]}}function mixinPropertiesHard(a,b){var s=Object.keys(a)
 for(var r=0;r<s.length;r++){var q=s[r]
-if(!b.hasOwnProperty(q))b[q]=a[q]}}var z=function(){var s=function(){}
+if(!b.hasOwnProperty(q))b[q]=a[q]}}function mixinPropertiesEasy(a,b){Object.assign(b,a)}var z=function(){var s=function(){}
 s.prototype={p:{}}
 var r=new s()
 if(!(r.__proto__&&r.__proto__.p===s.prototype.p))return false
@@ -19,10 +19,11 @@ a.prototype["$i"+a.name]=a
 if(b!=null){if(z){a.prototype.__proto__=b.prototype
 return}var s=Object.create(b.prototype)
 copyProperties(a.prototype,s)
-a.prototype=s}}function inheritMany(a,b){for(var s=0;s<b.length;s++)inherit(b[s],a)}function mixin(a,b){mixinProperties(b.prototype,a.prototype)
+a.prototype=s}}function inheritMany(a,b){for(var s=0;s<b.length;s++)inherit(b[s],a)}function mixinEasy(a,b){mixinPropertiesEasy(b.prototype,a.prototype)
+a.prototype.constructor=a}function mixinHard(a,b){mixinPropertiesHard(b.prototype,a.prototype)
 a.prototype.constructor=a}function lazyOld(a,b,c,d){var s=a
 a[b]=s
-a[c]=function(){a[c]=function(){H.rv(b)}
+a[c]=function(){a[c]=function(){A.rN(b)}
 var r
 var q=d
 try{if(a[b]===s){r=a[b]=q
@@ -34,33 +35,27 @@ a[c]=function(){return this[b]}
 return a[b]}}function lazyFinal(a,b,c,d){var s=a
 a[b]=s
 a[c]=function(){if(a[b]===s){var r=d()
-if(a[b]!==s)H.rw(b)
-a[b]=r}a[c]=function(){return this[b]}
-return a[b]}}function makeConstList(a){a.immutable$list=Array
+if(a[b]!==s)A.rO(b)
+a[b]=r}var q=a[b]
+a[c]=function(){return q}
+return q}}function makeConstList(a){a.immutable$list=Array
 a.fixed$length=Array
 return a}function convertToFastObject(a){function t(){}t.prototype=a
 new t()
 return a}function convertAllToFastObject(a){for(var s=0;s<a.length;++s)convertToFastObject(a[s])}var y=0
-function tearOffGetter(a,b,c,d,e){var s=null
-return e?function(f){if(s===null)s=H.lR(this,a,b,c,false,true,d)
-return new s(this,a[0],f,d)}:function(){if(s===null)s=H.lR(this,a,b,c,false,false,d)
-return new s(this,a[0],null,d)}}function tearOff(a,b,c,d,e,f){var s=null
-return d?function(){if(s===null)s=H.lR(this,a,b,c,true,false,e).prototype
-return s}:tearOffGetter(a,b,c,e,f)}var x=0
-function installTearOff(a,b,c,d,e,f,g,h,i,j){var s=[]
-for(var r=0;r<h.length;r++){var q=h[r]
-if(typeof q=="string")q=a[q]
-q.$callName=g[r]
-s.push(q)}var q=s[0]
-q.$R=e
-q.$D=f
-var p=i
-if(typeof p=="number")p+=x
-var o=h[0]
-q.$stubName=o
-var n=tearOff(s,j||0,p,c,o,d)
-a[b]=n
-if(c)q.$tearOff=n}function installStaticTearOff(a,b,c,d,e,f,g,h){return installTearOff(a,b,true,false,c,d,e,f,g,h)}function installInstanceTearOff(a,b,c,d,e,f,g,h,i){return installTearOff(a,b,false,c,d,e,f,g,h,i)}function setOrUpdateInterceptorsByTag(a){var s=v.interceptorsByTag
+function instanceTearOffGetter(a,b){var s=null
+return a?function(c){if(s===null)s=A.m7(b)
+return new s(c,this)}:function(){if(s===null)s=A.m7(b)
+return new s(this,null)}}function staticTearOffGetter(a){var s=null
+return function(){if(s===null)s=A.m7(a).prototype
+return s}}var x=0
+function tearOffParameters(a,b,c,d,e,f,g,h,i,j){if(typeof h=="number")h+=x
+return{co:a,iS:b,iI:c,rC:d,dV:e,cs:f,fs:g,fT:h,aI:i||0,nDA:j}}function installStaticTearOff(a,b,c,d,e,f,g,h){var s=tearOffParameters(a,true,false,c,d,e,f,g,h,false)
+var r=staticTearOffGetter(s)
+a[b]=r}function installInstanceTearOff(a,b,c,d,e,f,g,h,i,j){c=!!c
+var s=tearOffParameters(a,false,c,d,e,f,g,h,i,!!j)
+var r=instanceTearOffGetter(c,s)
+a[b]=r}function setOrUpdateInterceptorsByTag(a){var s=v.interceptorsByTag
 if(!s){v.interceptorsByTag=a
 return}copyProperties(a,s)}function setOrUpdateLeafTags(a){var s=v.leafTags
 if(!s){v.leafTags=a
@@ -68,40 +63,40 @@ return}copyProperties(a,s)}function updateTypes(a){var s=v.types
 var r=s.length
 s.push.apply(s,a)
 return r}function updateHolder(a,b){copyProperties(b,a)
-return a}var hunkHelpers=function(){var s=function(a,b,c,d,e){return function(f,g,h,i){return installInstanceTearOff(f,g,a,b,c,d,[h],i,e)}},r=function(a,b,c,d){return function(e,f,g,h){return installStaticTearOff(e,f,a,b,c,[g],h,d)}}
-return{inherit:inherit,inheritMany:inheritMany,mixin:mixin,installStaticTearOff:installStaticTearOff,installInstanceTearOff:installInstanceTearOff,_instance_0u:s(0,0,null,["$0"],0),_instance_1u:s(0,1,null,["$1"],0),_instance_2u:s(0,2,null,["$2"],0),_instance_0i:s(1,0,null,["$0"],0),_instance_1i:s(1,1,null,["$1"],0),_instance_2i:s(1,2,null,["$2"],0),_static_0:r(0,null,["$0"],0),_static_1:r(1,null,["$1"],0),_static_2:r(2,null,["$2"],0),makeConstList:makeConstList,lazy:lazy,lazyFinal:lazyFinal,lazyOld:lazyOld,updateHolder:updateHolder,convertToFastObject:convertToFastObject,setFunctionNamesIfNecessary:setFunctionNamesIfNecessary,updateTypes:updateTypes,setOrUpdateInterceptorsByTag:setOrUpdateInterceptorsByTag,setOrUpdateLeafTags:setOrUpdateLeafTags}}()
+return a}var hunkHelpers=function(){var s=function(a,b,c,d,e){return function(f,g,h,i){return installInstanceTearOff(f,g,a,b,c,d,[h],i,e,false)}},r=function(a,b,c,d){return function(e,f,g,h){return installStaticTearOff(e,f,a,b,c,[g],h,d)}}
+return{inherit:inherit,inheritMany:inheritMany,mixin:mixinEasy,mixinHard:mixinHard,installStaticTearOff:installStaticTearOff,installInstanceTearOff:installInstanceTearOff,_instance_0u:s(0,0,null,["$0"],0),_instance_1u:s(0,1,null,["$1"],0),_instance_2u:s(0,2,null,["$2"],0),_instance_0i:s(1,0,null,["$0"],0),_instance_1i:s(1,1,null,["$1"],0),_instance_2i:s(1,2,null,["$2"],0),_static_0:r(0,null,["$0"],0),_static_1:r(1,null,["$1"],0),_static_2:r(2,null,["$2"],0),makeConstList:makeConstList,lazy:lazy,lazyFinal:lazyFinal,lazyOld:lazyOld,updateHolder:updateHolder,convertToFastObject:convertToFastObject,setFunctionNamesIfNecessary:setFunctionNamesIfNecessary,updateTypes:updateTypes,setOrUpdateInterceptorsByTag:setOrUpdateInterceptorsByTag,setOrUpdateLeafTags:setOrUpdateLeafTags}}()
 function initializeDeferredHunk(a){x=v.types.length
-a(hunkHelpers,v,w,$)}function getGlobalFromName(a){for(var s=0;s<w.length;s++){if(w[s]==C)continue
-if(w[s][a])return w[s][a]}}var C={},H={lj:function lj(){},
-ll:function(a){return new H.bO("Field '"+a+"' has been assigned during initialization.")},
-y:function(a){return new H.bO("Field '"+a+"' has not been initialized.")},
-ml:function(a){return new H.bO("Field '"+a+"' has already been initialized.")},
-ax:function(a){return new H.f1(a)},
-ky:function(a){var s,r=a^48
+a(hunkHelpers,v,w,$)}var A={lB:function lB(){},
+oL(a,b,c){if(b.h("n<0>").b(a))return new A.dE(a,b.h("@<0>").B(c).h("dE<1,2>"))
+return new A.bE(a,b.h("@<0>").B(c).h("bE<1,2>"))},
+mD(a){return new A.cj("Field '"+A.f(a)+"' has been assigned during initialization.")},
+mE(a){return new A.cj("Field '"+a+"' has not been initialized.")},
+aD(a){return new A.fc(a)},
+kP(a){var s,r=a^48
 if(r<=9)return r
 s=a|32
 if(97<=s&&s<=102)return s-87
 return-1},
-cF:function(a,b,c){if(a==null)throw H.a(new H.da(b,c.h("da<0>")))
+bv(a,b,c){if(a==null)throw A.a(new A.dj(b,c.h("dj<0>")))
 return a},
-pv:function(a,b,c,d){P.f0(b,"start")
-if(c!=null){P.f0(c,"end")
-if(b>c)H.b(P.P(b,0,c,"start",null))}return new H.dj(a,b,c,d.h("dj<0>"))},
-p2:function(a,b,c,d){if(t.gw.b(a))return new H.a0(a,b,c.h("@<0>").I(d).h("a0<1,2>"))
-return new H.bQ(a,b,c.h("@<0>").I(d).h("bQ<1,2>"))},
-eB:function(){return new P.bk("No element")},
-oS:function(){return new P.bk("Too few elements")},
-pq:function(a,b){H.f5(a,0,J.ae(a)-1,b)},
-f5:function(a,b,c,d){if(c-b<=32)H.pp(a,b,c,d)
-else H.po(a,b,c,d)},
-pp:function(a,b,c,d){var s,r,q,p,o
-for(s=b+1,r=J.T(a);s<=c;++s){q=r.j(a,s)
+pK(a,b,c,d){A.fb(b,"start")
+if(c!=null){A.fb(c,"end")
+if(b>c)A.m(A.N(b,0,c,"start",null))}return new A.ds(a,b,c,d.h("ds<0>"))},
+iv(a,b,c,d){if(t.gw.b(a))return new A.a0(a,b,c.h("@<0>").B(d).h("a0<1,2>"))
+return new A.bW(a,b,c.h("@<0>").B(d).h("bW<1,2>"))},
+d2(){return new A.bl("No element")},
+p7(){return new A.bl("Too few elements")},
+pF(a,b){A.fg(a,0,J.at(a)-1,b)},
+fg(a,b,c,d){if(c-b<=32)A.pE(a,b,c,d)
+else A.pD(a,b,c,d)},
+pE(a,b,c,d){var s,r,q,p,o
+for(s=b+1,r=J.a3(a);s<=c;++s){q=r.j(a,s)
 p=s
 while(!0){if(!(p>b&&d.$2(r.j(a,p-1),q)>0))break
 o=p-1
-r.m(a,p,r.j(a,o))
-p=o}r.m(a,p,q)}},
-po:function(a3,a4,a5,a6){var s,r,q,p,o,n,m,l,k,j,i=C.c.a1(a5-a4+1,6),h=a4+i,g=a5-i,f=C.c.a1(a4+a5,2),e=f-i,d=f+i,c=J.T(a3),b=c.j(a3,h),a=c.j(a3,e),a0=c.j(a3,f),a1=c.j(a3,d),a2=c.j(a3,g)
+r.p(a,p,r.j(a,o))
+p=o}r.p(a,p,q)}},
+pD(a3,a4,a5,a6){var s,r,q,p,o,n,m,l,k,j,i=B.c.a3(a5-a4+1,6),h=a4+i,g=a5-i,f=B.c.a3(a4+a5,2),e=f-i,d=f+i,c=J.a3(a3),b=c.j(a3,h),a=c.j(a3,e),a0=c.j(a3,f),a1=c.j(a3,d),a2=c.j(a3,g)
 if(a6.$2(b,a)>0){s=a
 a=b
 b=s}if(a6.$2(a1,a2)>0){s=a2
@@ -120,345 +115,364 @@ a=s}if(a6.$2(a,a0)>0){s=a0
 a0=a
 a=s}if(a6.$2(a1,a2)>0){s=a2
 a2=a1
-a1=s}c.m(a3,h,b)
-c.m(a3,f,a0)
-c.m(a3,g,a2)
-c.m(a3,e,c.j(a3,a4))
-c.m(a3,d,c.j(a3,a5))
+a1=s}c.p(a3,h,b)
+c.p(a3,f,a0)
+c.p(a3,g,a2)
+c.p(a3,e,c.j(a3,a4))
+c.p(a3,d,c.j(a3,a5))
 r=a4+1
 q=a5-1
-if(J.O(a6.$2(a,a1),0)){for(p=r;p<=q;++p){o=c.j(a3,p)
+if(J.I(a6.$2(a,a1),0)){for(p=r;p<=q;++p){o=c.j(a3,p)
 n=a6.$2(o,a)
 if(n===0)continue
-if(n<0){if(p!==r){c.m(a3,p,c.j(a3,r))
-c.m(a3,r,o)}++r}else for(;!0;){n=a6.$2(c.j(a3,q),a)
+if(n<0){if(p!==r){c.p(a3,p,c.j(a3,r))
+c.p(a3,r,o)}++r}else for(;!0;){n=a6.$2(c.j(a3,q),a)
 if(n>0){--q
 continue}else{m=q-1
-if(n<0){c.m(a3,p,c.j(a3,r))
+if(n<0){c.p(a3,p,c.j(a3,r))
 l=r+1
-c.m(a3,r,c.j(a3,q))
-c.m(a3,q,o)
+c.p(a3,r,c.j(a3,q))
+c.p(a3,q,o)
 q=m
 r=l
-break}else{c.m(a3,p,c.j(a3,q))
-c.m(a3,q,o)
+break}else{c.p(a3,p,c.j(a3,q))
+c.p(a3,q,o)
 q=m
 break}}}}k=!0}else{for(p=r;p<=q;++p){o=c.j(a3,p)
-if(a6.$2(o,a)<0){if(p!==r){c.m(a3,p,c.j(a3,r))
-c.m(a3,r,o)}++r}else if(a6.$2(o,a1)>0)for(;!0;)if(a6.$2(c.j(a3,q),a1)>0){--q
+if(a6.$2(o,a)<0){if(p!==r){c.p(a3,p,c.j(a3,r))
+c.p(a3,r,o)}++r}else if(a6.$2(o,a1)>0)for(;!0;)if(a6.$2(c.j(a3,q),a1)>0){--q
 if(q<p)break
 continue}else{m=q-1
-if(a6.$2(c.j(a3,q),a)<0){c.m(a3,p,c.j(a3,r))
+if(a6.$2(c.j(a3,q),a)<0){c.p(a3,p,c.j(a3,r))
 l=r+1
-c.m(a3,r,c.j(a3,q))
-c.m(a3,q,o)
-r=l}else{c.m(a3,p,c.j(a3,q))
-c.m(a3,q,o)}q=m
+c.p(a3,r,c.j(a3,q))
+c.p(a3,q,o)
+r=l}else{c.p(a3,p,c.j(a3,q))
+c.p(a3,q,o)}q=m
 break}}k=!1}j=r-1
-c.m(a3,a4,c.j(a3,j))
-c.m(a3,j,a)
+c.p(a3,a4,c.j(a3,j))
+c.p(a3,j,a)
 j=q+1
-c.m(a3,a5,c.j(a3,j))
-c.m(a3,j,a1)
-H.f5(a3,a4,r-2,a6)
-H.f5(a3,q+2,a5,a6)
+c.p(a3,a5,c.j(a3,j))
+c.p(a3,j,a1)
+A.fg(a3,a4,r-2,a6)
+A.fg(a3,q+2,a5,a6)
 if(k)return
-if(r<h&&q>g){for(;J.O(a6.$2(c.j(a3,r),a),0);)++r
-for(;J.O(a6.$2(c.j(a3,q),a1),0);)--q
+if(r<h&&q>g){for(;J.I(a6.$2(c.j(a3,r),a),0);)++r
+for(;J.I(a6.$2(c.j(a3,q),a1),0);)--q
 for(p=r;p<=q;++p){o=c.j(a3,p)
-if(a6.$2(o,a)===0){if(p!==r){c.m(a3,p,c.j(a3,r))
-c.m(a3,r,o)}++r}else if(a6.$2(o,a1)===0)for(;!0;)if(a6.$2(c.j(a3,q),a1)===0){--q
+if(a6.$2(o,a)===0){if(p!==r){c.p(a3,p,c.j(a3,r))
+c.p(a3,r,o)}++r}else if(a6.$2(o,a1)===0)for(;!0;)if(a6.$2(c.j(a3,q),a1)===0){--q
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-ic:function ic(a,b){var _=this
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-kA:function kA(a){this.a=a},
-kB:function kB(a){this.a=a},
-eD:function eD(a,b){var _=this
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-dA:function dA(a){this.b=a},
-fQ:function fQ(a,b,c){this.a=a
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-qw:function(a){return a},
-p4:function(a){return new Int8Array(a)},
-p5:function(a,b,c){if(!H.aR(b))H.b(P.t("Invalid view offsetInBytes "+H.d(b)))
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-eS:function eS(){},
-im:function im(){},
-cg:function cg(){},
-d7:function d7(){},
-d8:function d8(){},
-eN:function eN(){},
-eO:function eO(){},
-eP:function eP(){},
-eQ:function eQ(){},
-eR:function eR(){},
-eT:function eT(){},
-eU:function eU(){},
-d9:function d9(){},
-bR:function bR(){},
-dB:function dB(){},
-dC:function dC(){},
-dD:function dD(){},
-dE:function dE(){},
-pm:function(a,b){var s=b.c
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-mt:function(a,b){var s=b.c
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+f2:function f2(){},
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+eZ:function eZ(){},
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+f1:function f1(){},
+f3:function f3(){},
+f4:function f4(){},
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+bX:function bX(){},
+dL:function dL(){},
+dM:function dM(){},
+dN:function dN(){},
+dO:function dO(){},
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-aE:function(a){return H.hb(v.typeUniverse,a,!1)},
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+r=A.bu(a,s,a0,a1)
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-return H.lF(a,r,!0)
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+r=A.bu(a,s,a0,a1)
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-return H.mU(a,r,!0)
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+p=A.e4(a,q,a0,a1)
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-return H.dL(a,b.z,p)
+return A.dV(a,b.z,p)
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+l=A.e4(a,m,a0,a1)
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-return H.lD(a,n,l)
+return A.lU(a,n,l)
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+j=A.bu(a,k,a0,a1)
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+h=A.rd(a,i,a0,a1)
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-return H.mT(a,j,h)
+return A.nc(a,j,h)
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-f=H.dW(a,g,a0,a1)
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+n=A.bu(a,o,a0,a1)
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-return H.lE(a,n,f,!0)
+return A.lV(a,n,f,!0)
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-default:throw H.a(P.hn("Attempted to substitute unexpected RTI kind "+c))}},
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-lK:function(a){var s=a.constructor,r=s.$ccache
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-return H.dT(q,a,H.qz)},
-dT:function(a,b,c){a.b=c
+return a.x=p==null?q.x=new A.dT(q):p},
+l(a){return A.bw(A.hm(v.typeUniverse,a,!1))},
+qU(a){var s,r,q,p=this,o=t.K
+if(p===o)return A.cL(p,a,A.r_)
+if(!A.b9(p))if(!(p===t._))o=p===o
+else o=!0
+else o=!0
+if(o)return A.cL(p,a,A.r2)
+o=p.y
+s=o===6?p.z:p
+if(s===t.S)r=A.aX
+else if(s===t.gR||s===t.di)r=A.qZ
+else if(s===t.N)r=A.r0
+else r=s===t.y?A.hs:null
+if(r!=null)return A.cL(p,a,r)
+if(s.y===9){q=s.z
+if(s.Q.every(A.rE)){p.r="$i"+q
+if(q==="t")return A.cL(p,a,A.qY)
+return A.cL(p,a,A.r1)}}else if(o===7)return A.cL(p,a,A.qR)
+return A.cL(p,a,A.qP)},
+cL(a,b,c){a.b=c
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-qD:function(a){var s,r,q=this
-if(!H.b4(q))if(!(q===t._))s=q===t.K
+qT(a){var s,r,q=this
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-else r=H.qA
+if(s)r=A.qC
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+else r=A.qQ
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-qB:function(a){if(a==null)return!0
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-if(a==null)return H.lN(r)
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+s=r.r
+if(a instanceof A.e)return!!a[s]
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 s=r.r
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-return!!J.aF(a)[s]},
-tr:function(a){var s=this
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+tJ(a){var s=this
 if(a==null)return a
 else if(s.b(a))return a
-H.n8(a,s)},
-qA:function(a){var s=this
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 if(a==null)return a
 else if(s.b(a))return a
-H.n8(a,s)},
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-mP:function(a,b,c){var s=P.bH(a),r=H.am(b==null?H.as(a):b,null)
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-pZ:function(a){return new H.dK("TypeError: "+a)},
-ac:function(a,b){return new H.dK("TypeError: "+H.mP(a,null,b))},
-qJ:function(a){return a!=null},
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-qM:function(a){return!0},
-qm:function(a){return a},
-hi:function(a){return!0===a||!1===a},
-tg:function(a){if(!0===a)return!0
+A.ns(a,s)},
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+n7(a,b,c){var s=A.bP(a),r=A.as(b==null?A.ay(a):b,null)
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+qd(a){return new A.dU("TypeError: "+a)},
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-throw H.a(H.ac(a,"bool"))},
-k_:function(a){if(!0===a)return!0
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-throw H.a(H.ac(a,"bool"))},
-th:function(a){if(!0===a)return!0
+throw A.a(A.ai(a,"bool"))},
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-throw H.a(H.ac(a,"double"))},
-tk:function(a){if(typeof a=="number")return a
+throw A.a(A.ai(a,"bool?"))},
+tA(a){if(typeof a=="number")return a
+throw A.a(A.ai(a,"double"))},
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-throw H.a(H.ac(a,"double"))},
-tj:function(a){if(typeof a=="number")return a
+throw A.a(A.ai(a,"double"))},
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-throw H.a(H.ac(a,"double?"))},
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-throw H.a(H.ac(a,"int"))},
-bp:function(a){if(typeof a=="number"&&Math.floor(a)===a)return a
+throw A.a(A.ai(a,"double?"))},
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+tD(a){if(typeof a=="number"&&Math.floor(a)===a)return a
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-throw H.a(H.ac(a,"int"))},
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-throw H.a(H.ac(a,"num"))},
-n6:function(a){if(typeof a=="number")return a
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+A.qb(a.u,a.e,o)
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-k=!1}else{if(q===4)if(J.e1(a5,"file",0)){if(p<=0){if(!C.a.aq(a5,"/",n)){g="file:///"
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-a5=C.a.aK(a5,o,n,"")
+a5=B.a.az(a5,o,n,"")
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-a5=J.m2(a5,o,n,"")
+a5=B.a.az(a5,o,n,"")
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-if(a4<i){a5=J.m3(a5,0,a4)
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-b=P.qd(a5,p,o,!1)
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+r=s}p=!1}++s}else if(o<=93&&(B.K[o>>>4]&1<<(o&15))!==0){A.cK(a,s,"Invalid character")
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+l=B.a.w(a,r,s)
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-qa:function(a){if(a==="http")return"http"
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+qq(a){if(a==="http")return"http"
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-lI:function(a,b,c,d,e,f){var s,r=e==="file",q=r||f
+qv(a,b,c){if(a==null)return""
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-return P.qj(a)},
-qe:function(a,b,c,d){if(a!=null)return P.dP(a,b,c,C.t,!0)
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+if(s&&!c&&!B.a.aa(a,"/"))return A.qy(a,!s||c)
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+qs(a,b,c){if(a==null)return null
+return A.dZ(a,b,c,B.r,!0)},
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-s=C.a.T(a,b+1)
-r=C.a.T(a,n)
-q=H.ky(s)
-p=H.ky(r)
+s=B.a.U(a,b+1)
+r=B.a.U(a,n)
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+p=A.kP(r)
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-if(s>=97||r>=97)return C.a.A(a,b,b+3).toUpperCase()
+if(o<127&&(B.M[B.c.a0(o,4)]&1<<(o&15))!==0)return A.iF(c&&65<=o&&90>=o?(o|32)>>>0:o)
+if(s>=97||r>=97)return B.a.w(a,b,b+3).toUpperCase()
 return null},
-lH:function(a){var s,r,q,p,o,n="0123456789ABCDEF"
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-s[1]=C.a.G(n,a>>>4)
-s[2]=C.a.G(n,a&15)}else{if(a>2047)if(a>65535){r=240
+s[1]=B.a.G(n,a>>>4)
+s[2]=B.a.G(n,a&15)}else{if(a>2047)if(a>65535){r=240
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 q=2}s=new Uint8Array(3*q)
-for(p=0;--q,q>=0;r=128){o=C.c.bq(a,6*q)&63|r
+for(p=0;--q,q>=0;r=128){o=B.c.f3(a,6*q)&63|r
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-s[p+1]=C.a.G(n,o>>>4)
-s[p+2]=C.a.G(n,o&15)
-p+=3}}return P.pt(s,0,null)},
-dP:function(a,b,c,d,e){var s=P.n3(a,b,c,d,e)
-return s==null?C.a.A(a,b,c):s},
-n3:function(a,b,c,d,e){var s,r,q,p,o,n,m,l,k,j=null
-for(s=!e,r=b,q=r,p=j;r<c;){o=C.a.T(a,r)
+s[p+1]=B.a.G(n,o>>>4)
+s[p+2]=B.a.G(n,o&15)
+p+=3}}return A.pI(s,0,null)},
+dZ(a,b,c,d,e){var s=A.nm(a,b,c,d,e)
+return s==null?B.a.w(a,b,c):s},
+nm(a,b,c,d,e){var s,r,q,p,o,n,m,l,k,j=null
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-else{if(o===37){n=P.lJ(a,r,!1)
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-m=1}else m=3}else if(s&&o<=93&&(C.M[o>>>4]&1<<(o&15))!==0){P.cA(a,r,"Invalid character")
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+m=1}else m=3}else if(s&&o<=93&&(B.K[o>>>4]&1<<(o&15))!==0){A.cK(a,r,"Invalid character")
+A.aD(u.g)
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-if(l<c){k=C.a.T(a,l)
+if(l<c){k=B.a.U(a,l)
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-n=P.lH(o)}if(p==null){p=new P.a2("")
+n=A.lY(o)}if(p==null){p=new A.a1("")
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-l.a+=C.a.A(a,q,r)
-l.a+=H.d(n)
+l.a+=B.a.w(a,q,r)
+l.a+=A.f(n)
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-if(q<c)p.a+=C.a.A(a,q,c)
+if(q<c)p.a+=B.a.w(a,q,c)
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-n2:function(a){if(C.a.aa(a,"."))return!0
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-qj:function(a){var s,r,q,p,o,n
-if(!P.n2(a))return a
-s=H.i([],t.s)
+nl(a){if(B.a.aa(a,"."))return!0
+return B.a.dk(a,"/.")!==-1},
+qz(a){var s,r,q,p,o,n
+if(!A.nl(a))return a
+s=A.h([],t.s)
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-if(J.O(n,"..")){if(s.length!==0){s.pop()
+if(J.I(n,"..")){if(s.length!==0){s.pop()
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-return C.e.aJ(s,"/")},
-qi:function(a,b){var s,r,q,p,o,n
-if(!P.n2(a))return!b?P.mZ(a):a
-s=H.i([],t.s)
+return B.d.aO(s,"/")},
+qy(a,b){var s,r,q,p,o,n
+if(!A.nl(a))return!b?A.nh(a):a
+s=A.h([],t.s)
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-if(".."===n)if(s.length!==0&&C.e.gb8(s)!==".."){s.pop()
+if(".."===n)if(s.length!==0&&B.d.gb6(s)!==".."){s.pop()
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-if(r===58)return C.a.A(a,0,s)+"%3A"+C.a.av(a,s+1)
-if(r>127||(C.N[r>>>4]&1<<(r&15))===0)break}return a},
-n_:function(a){var s=a|32
+if(p||B.d.gb6(s)==="..")s.push("")
+if(!b)s[0]=A.nh(s[0])
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-cr:function(a){return this.at(a,!0)},
-gk:function(a){var s,r=this.gv(this)
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-P.iW.prototype={
-$2:function(a,b){throw H.a(P.Q("Illegal IPv4 address, "+a,this.a,b))},
+A.j4.prototype={
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+$S:30}
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-$S:51}
-P.iZ.prototype={
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 if(s<0||s>65535)this.a.$2("each part must be in the range of `0x0..0xFFFF`",a)
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-if(s===b.gdJ()){s=q.r
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-i:function(a){var s=this.a
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-$S:33}
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+return{dI:s("lv"),gF:s("cV<cv,@>"),p:s("aN<k*,p>"),gw:s("n<@>"),C:s("w"),G:s("c"),aQ:s("R"),Y:s("b_"),c:s("M<@>"),bq:s("M<~>"),Z:s("cg<@>"),R:s("d<@>"),J:s("d<e?>"),I:s("B<e>"),s:s("B<k>"),gN:s("B<c3>"),b:s("B<@>"),t:s("B<b>"),F:s("B<R*>"),M:s("B<e*>"),V:s("B<k*>"),H:s("B<lI*>"),i:s("B<b*>"),T:s("d5"),g:s("aO"),aU:s("ao<@>"),eo:s("ad<cv,@>"),dr:s("ag<@>"),eE:s("ag<am*>"),e:s("d8<@>"),cK:s("bV<@,@>"),j:s("t<@>"),W:s("t<e?>"),L:s("cm"),gT:s("b2<@,@>"),h:s("de<@,@>"),f:s("T<@,@>"),br:s("T<k,e?>"),eL:s("K<k,e>"),m:s("b3"),bm:s("bX"),P:s("p"),K:s("e"),eZ:s("aQ"),D:s("F<@>"),bJ:s("dn<k>"),bh:s("rY"),d_:s("j<@>"),e2:s("aS<@>"),n:s("cs<@>"),fP:s("c2<@,@>"),E:s("dp<@>"),gm:s("ae"),bw:s("fj<@>"),N:s("k"),a:s("x<@>"),dd:s("lI"),eK:s("aT"),ak:s("bm"),bo:s("dt<e?>"),v:s("aU<k,e?>"),o:s("c4"),bj:s("a7<bR>"),gX:s("a7<aQ>"),r:s("a7<@>"),c3:s("a7<Z*>"),gp:s("aF<@,@>"),am:s("b6<bc*>"),U:s("b6<c*>"),ao:s("q<bR>"),u:s("q<aQ>"),d:s("q<@>"),fJ:s("q<b>"),eu:s("q<Z*>"),q:s("q<~>"),aH:s("c6<@,@>"),gA:s("cE"),bX:s("dS<aQ>"),B:s("cI<k*>"),y:s("Z"),gR:s("G"),z:s("@"),w:s("@(e)"),Q:s("@(e,ae)"),S:s("b"),c1:s("aZ*"),bE:s("ac<e*>*"),aL:s("c*"),x:s("am*"),bQ:s("b3*"),A:s("0&*"),_:s("e*"),eQ:s("aR*"),fc:s("cr*"),O:s("k*"),l:s("av*"),gz:s("Z*"),eH:s("M<p>?"),X:s("e?"),di:s("ll"),aT:s("~"),d5:s("~(e)"),k:s("~(e,ae)")}})();(function constants(){var s=hunkHelpers.makeConstList
+B.H=A.eD.prototype
+B.an=A.bR.prototype
+B.ao=J.an.prototype
+B.d=J.B.prototype
+B.q=J.d3.prototype
+B.c=J.d4.prototype
+B.k=J.bU.prototype
+B.a=J.b0.prototype
+B.ap=J.aO.prototype
+B.Q=A.bX.prototype
+B.R=J.fa.prototype
+B.B=J.bm.prototype
+B.bK=A.dv.prototype
+B.bL=A.dw.prototype
+B.a1=new A.aZ("failed")
+B.a2=new A.aZ("started")
+B.a3=new A.aZ("succeeded")
+B.bN=new A.ee()
+B.a4=new A.ed()
+B.a5=new A.ex(A.aj("ex<0&*>"))
+B.o=new A.ew()
+B.a6=new A.eL()
+B.C=function getTagFallback(o) {
   var s = Object.prototype.toString.call(o);
   return s.substring(8, s.length - 1);
 }
-C.a7=function() {
+B.a7=function() {
   var toStringFunction = Object.prototype.toString;
   function getTag(o) {
     var s = toStringFunction.call(o);
@@ -8855,7 +8899,7 @@ C.a7=function() {
     prototypeForTag: prototypeForTag,
     discriminator: discriminator };
 }
-C.ac=function(getTagFallback) {
+B.ac=function(getTagFallback) {
   return function(hooks) {
     if (typeof navigator != "object") return hooks;
     var ua = navigator.userAgent;
@@ -8869,11 +8913,11 @@ C.ac=function(getTagFallback) {
     hooks.getTag = getTagFallback;
   };
 }
-C.a8=function(hooks) {
+B.a8=function(hooks) {
   if (typeof dartExperimentalFixupGetTag != "function") return hooks;
   hooks.getTag = dartExperimentalFixupGetTag(hooks.getTag);
 }
-C.a9=function(hooks) {
+B.a9=function(hooks) {
   var getTag = hooks.getTag;
   var prototypeForTag = hooks.prototypeForTag;
   function getTagFixed(o) {
@@ -8891,7 +8935,7 @@ C.a9=function(hooks) {
   hooks.getTag = getTagFixed;
   hooks.prototypeForTag = prototypeForTagFixed;
 }
-C.ab=function(hooks) {
+B.ab=function(hooks) {
   var userAgent = typeof navigator == "object" ? navigator.userAgent : "";
   if (userAgent.indexOf("Firefox") == -1) return hooks;
   var getTag = hooks.getTag;
@@ -8908,7 +8952,7 @@ C.ab=function(hooks) {
   }
   hooks.getTag = getTagFirefox;
 }
-C.aa=function(hooks) {
+B.aa=function(hooks) {
   var userAgent = typeof navigator == "object" ? navigator.userAgent : "";
   if (userAgent.indexOf("Trident/") == -1) return hooks;
   var getTag = hooks.getTag;
@@ -8937,243 +8981,245 @@ C.aa=function(hooks) {
   hooks.getTag = getTagIE;
   hooks.prototypeForTag = prototypeForTagIE;
 }
-C.E=function(hooks) { return hooks; }
+B.D=function(hooks) { return hooks; }
 
-C.j=new P.eF()
-C.ad=new P.eY()
-C.F=new P.fm()
-C.ae=new P.fn()
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-C.H=new H.jO()
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-C.ag=new P.ap(5e6)
-C.A=H.j("Z")
-C.m=H.i(s([]),t.F)
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-C.bo=H.j("f")
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-C.ah=new U.U(C.X,C.x)
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-C.al=new U.U(C.Z,C.m)
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-C.v=new U.U(C.y,C.aP)
-C.Y=H.j("at<@>")
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-C.ai=new U.U(C.Y,C.L)
-C.aj=new U.U(C.y,C.L)
-C.V=H.j("b7<@,@>")
-C.ak=new U.U(C.V,C.x)
-C.z=H.j("l")
-C.d=new U.U(C.z,C.m)
-C.B=H.j("c")
-C.k=new U.U(C.B,C.m)
-C.b=new U.U(null,C.m)
-C.U=H.j("aU")
-C.J=new U.U(C.U,C.m)
-C.W=H.j("aH<@,@>")
-C.am=new U.U(C.W,C.x)
-C.q=new U.c9(C.a5,t.Z)
-C.ar=new P.eH(null)
-C.as=new P.eI(null)
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-C.au=new Y.cd("SEVERE",1000)
-C.K=new Y.cd("WARNING",900)
-C.M=H.i(s([0,0,32776,33792,1,10240,0,0]),t.i)
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-C.br=H.j("bV")
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-C.aR=H.i(s([C.br,C.bL]),t.H)
-C.o=new H.aI(0,{},C.h,H.aE("aI<@,@>"))
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-C.Q=new H.aI(0,{},C.aG,H.aE("aI<cm*,@>"))
-C.aA=H.i(s(["nbkbficgbembimioedhceniahniffgpl"]),t.V)
-C.aS=new H.aI(1,{nbkbficgbembimioedhceniahniffgpl:null},C.aA,t.p)
-C.T=new P.cy(C.aS,t.B)
-C.aC=H.i(s(["Overlay.inspectNodeRequested"]),t.V)
-C.aT=new H.aI(1,{"Overlay.inspectNodeRequested":null},C.aC,t.p)
-C.aU=new P.cy(C.aT,t.B)
-C.aV=new H.cl("call")
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-C.b_=H.j("ld")
-C.b0=H.j("rz")
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-C.ba=H.j("oH")
-C.bb=H.j("oI")
-C.bc=H.j("oL")
-C.bd=H.j("oM")
-C.be=H.j("av")
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-C.bi=H.j("rE")
-C.bj=H.j("cb")
-C.bk=H.j("cZ")
-C.bl=H.j("d4")
-C.bm=H.j("n")
-C.bn=H.j("dc")
-C.bp=H.j("ms")
-C.bs=H.j("di")
-C.bt=H.j("pw")
-C.bu=H.j("px")
-C.bv=H.j("py")
-C.bw=H.j("bY")
-C.bx=H.j("c_")
-C.a_=H.j("H")
-C.f=H.j("@")
-C.a0=H.j("l4")
-C.bO=new P.h8("")})();(function staticFields(){$.jI=null
-$.m8=null
-$.m7=null
-$.np=null
-$.ni=null
-$.nv=null
-$.kt=null
-$.kC=null
-$.lS=null
-$.cB=null
-$.dU=null
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-$.lL=!1
-$.p=C.i
-$.c4=H.i([],t.I)
-$.mI=null
-$.mJ=null
-$.mK=null
+B.i=new A.eP()
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+B.ag=new A.aB(5e6)
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+B.w=A.h(s([B.u,B.u]),t.F)
+B.ah=new A.R(B.U,B.w,!1)
+B.X=A.l("az<@>")
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+B.ai=new A.R(B.X,B.O,!1)
+B.T=A.l("aZ")
+B.I=new A.R(B.T,B.l,!1)
+B.z=A.l("Z")
+B.m=new A.R(B.z,B.l,!1)
+B.W=A.l("bb<@,@>")
+B.ak=new A.R(B.W,B.w,!1)
+B.x=A.l("ac<@>")
+B.al=new A.R(B.x,B.O,!1)
+B.y=A.l("k")
+B.e=new A.R(B.y,B.l,!1)
+B.A=A.l("b")
+B.j=new A.R(B.A,B.l,!1)
+B.b=new A.R(null,B.l,!1)
+B.Y=A.l("am")
+B.aj=new A.R(B.Y,B.l,!1)
+B.ay=A.h(s([B.aj]),t.F)
+B.v=new A.R(B.x,B.ay,!1)
+B.V=A.l("aM<@,@>")
+B.am=new A.R(B.V,B.w,!1)
+B.p=new A.cg(B.a5,t.Z)
+B.aq=new A.eR(null)
+B.ar=new A.eS(null)
+B.as=new A.ck("INFO",800)
+B.at=new A.ck("SEVERE",1000)
+B.J=new A.ck("WARNING",900)
+B.K=A.h(s([0,0,32776,33792,1,10240,0,0]),t.i)
+B.b4=A.l("bN")
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+B.bo=A.l("bZ")
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+B.bg=A.l("bT")
+B.bH=A.l("fV")
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+B.b3=A.l("bM")
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+B.n=new A.aN(0,{},B.f,A.aj("aN<@,@>"))
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+B.Z=A.l("p")
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+B.bn=A.l("mO")
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-$.mE=$
-$.jd=$
-$.mF=$
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-$.hf=P.ie(H.aE("c*"))
-$.lP=P.ie(t.l)
-$.c3=H.i([],H.aE("G<c8*>"))})();(function lazyInitializers(){var s=hunkHelpers.lazyFinal,r=hunkHelpers.lazy,q=hunkHelpers.lazyOld
-s($,"rB","lU",function(){return H.rf("_$dart_dartClosure")})
-s($,"tz","l8",function(){return C.i.dM(new H.l3())})
-s($,"rI","nA",function(){return H.aZ(H.iU({
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-s($,"rJ","nB",function(){return H.aZ(H.iU({$method$:null,
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-s($,"rK","nC",function(){return H.aZ(H.iU(null))})
-s($,"rL","nD",function(){return H.aZ(function(){var $argumentsExpr$="$arguments$"
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 else s([])})})()
 //# sourceMappingURL=background.dart.js.map
diff --git a/dwds/debug_extension/web/content.js b/dwds/debug_extension/web/content.js
index 6216f2dd8..4c49ee2c0 100644
--- a/dwds/debug_extension/web/content.js
+++ b/dwds/debug_extension/web/content.js
@@ -1,39 +1,35 @@
-var hasSent = false;
+const MULTIPLE_APPS_ATTRIBUTE = 'data-multiple-dart-apps';
+
+const MULTIPLE_APPS_WARNING = 'It appears that you are running multiple Dart apps ' +
+    'and/or sub-apps. Dart debugging is currently not supported in a multi-app ' +
+    'environment.';
 
 function sendMessage(e) {
-    if (hasSent) return;
-    hasSent = true;
-    chrome.runtime.sendMessage(e, function (response) {
-    });
+    const hasMultipleApps = document
+        .documentElement
+        .getAttribute(MULTIPLE_APPS_ATTRIBUTE);
+    const warning = hasMultipleApps == 'true' ?  MULTIPLE_APPS_WARNING : '';
+    chrome.runtime.sendMessage(Object.assign(e, {warning: warning}));
 }
 
-document.addEventListener('dart-app-ready', function (e) {
+document.addEventListener('dart-app-ready', function(e) {
     sendMessage(e);
 });
 
-var targetNode = document.head;
-var observerOptions = {
-    childList: true,
-    attributes: true,
-    subtree: true
-};
 
-function callback(mutationList, observer) {
-    mutationList.forEach((mutation) => {
-        if (mutation.type == 'childList') {
-            var addedNodes = mutation.addedNodes
-            for (var i = 0; i < addedNodes.length; i++) {
-                if (addedNodes[i].tagName == 'SCRIPT' &&
-                    addedNodes[i].src.includes('dart_sdk.js')) {
-                    sendMessage({});
-                }
-            }
+function multipleDartAppsCallback(mutationList) {
+    mutationList.forEach(function(mutation) {
+        if (mutation.type !== "attributes") return;
+        if (mutation.attributeName === MULTIPLE_APPS_ATTRIBUTE) {
+            sendMessage({});
         }
     });
-}
+};
+
+// Watch for changes to the multiple apps data-attribute and update accordingly:
+var multipleDartAppsObserver = new MutationObserver(multipleDartAppsCallback);
+multipleDartAppsObserver.observe(document.documentElement, {
+    attributeFilter: [MULTIPLE_APPS_ATTRIBUTE]
+});
 
-// TODO(grouma) - This will become unnecessary when package:dwds version 11.0.0
-// hits Flutter stable.
-var observer = new MutationObserver(callback);
-observer.observe(targetNode, observerOptions);
 
diff --git a/dwds/debug_extension/web/dart_warning.png b/dwds/debug_extension/web/dart_warning.png
new file mode 100644
index 000000000..9608d0d1e
Binary files /dev/null and b/dwds/debug_extension/web/dart_warning.png differ
diff --git a/dwds/lib/src/version.dart b/dwds/lib/src/version.dart
index 83ab08232..2a3eeb8d1 100644
--- a/dwds/lib/src/version.dart
+++ b/dwds/lib/src/version.dart
@@ -1,2 +1,2 @@
 // Generated code. Do not modify.
-const packageVersion = '11.5.1';
+const packageVersion = '11.5.2-dev';
diff --git a/dwds/pubspec.yaml b/dwds/pubspec.yaml
index c551bc5ab..f67bca389 100644
--- a/dwds/pubspec.yaml
+++ b/dwds/pubspec.yaml
@@ -1,6 +1,6 @@
 name: dwds
 # Every time this changes you need to run `dart run build_runner build`.
-version: 11.5.1
+version: 11.5.2-dev
 homepage: https://github.com/dart-lang/webdev/tree/master/dwds
 description: >-
   A service that proxies between the Chrome debug protocol and the Dart VM
diff --git a/dwds/test/debug_extension_test.dart b/dwds/test/debug_extension_test.dart
index 98331bb36..89ca0a763 100644
--- a/dwds/test/debug_extension_test.dart
+++ b/dwds/test/debug_extension_test.dart
@@ -14,9 +14,15 @@
 import 'package:dwds/src/handlers/injector.dart';
 import 'package:http/http.dart' as http;
 import 'package:test/test.dart';
+import 'package:webdriver/io.dart';
 
 import 'fixtures/context.dart';
+import 'fixtures/utilities.dart';
 
+// Instructions for running:
+// * From the /dwds/debug_extension, build the extension: pub run build_runner build web -o build -r
+// * From the /dwds, run: dart test test/debug_extension_test.dart
+// * See note for Googlers below as well
 // [For Googlers]
 // A whitelisted developer key is needed to run these tests locally.
 // Add a developer key to dwds/debug_extension/web/manifest.json.
@@ -70,6 +76,33 @@ void main() async {
           expect(await context.webDriver.title, 'Dart DevTools');
         });
       });
+
+      group('With a sharded Dart app', () {
+        setUp(() async {
+          await context.setUp(
+              enableDebugExtension: true, serveDevTools: true, useSse: useSse);
+          var htmlTag =
+              await context.webDriver.findElement(const By.tagName('html'));
+
+          await context.webDriver.execute(
+              "arguments[0].setAttribute('data-multiple-dart-apps', 'true');",
+              [htmlTag]);
+        });
+
+        tearDown(() async {
+          await context.tearDown();
+        });
+
+        test('opens an alert', () async {
+          await context.extensionConnection.sendCommand('Runtime.evaluate', {
+            'expression': 'fakeClick()',
+          });
+          // Wait for the alert to open.
+          var alert =
+              await retryFn<Alert>(() => context.webDriver.switchTo.alert);
+          expect(alert, isNotNull);
+        });
+      });
     });
   }
 
diff --git a/dwds/test/fixtures/utilities.dart b/dwds/test/fixtures/utilities.dart
index 359dace1d..ceec0767e 100644
--- a/dwds/test/fixtures/utilities.dart
+++ b/dwds/test/fixtures/utilities.dart
@@ -41,3 +41,30 @@ int daemonPort(String workingDirectory) {
 
 String _assetServerPortFilePath(String workingDirectory) =>
     '${daemonWorkspace(workingDirectory)}/.asset_server_port';
+
+/// Retries a callback function with a delay until the result is non-null.
+Future<T> retryFn<T>(
+  T Function() callback, {
+  int retryCount = 3,
+  int delayInMs = 1000,
+  String failureMessage = 'Function did not succeed after retries.',
+}) async {
+  if (retryCount == 0) {
+    throw Exception(failureMessage);
+  }
+
+  await Future.delayed(Duration(milliseconds: delayInMs));
+  try {
+    final result = callback();
+    if (result != null) return result;
+  } catch (_) {
+    // Ignore any exceptions.
+  }
+
+  return retryFn<T>(
+    callback,
+    retryCount: retryCount - 1,
+    delayInMs: delayInMs,
+    failureMessage: failureMessage,
+  );
+}