Fix simplest cases of ActionUpdateThread (#7407)

Partially addresses
#7330

These are classes where there's clearly no UI manipulations happening in
`update` in either the direct classes or inheriting children.

Author: helin24

flutter-idea/src/io/flutter/actions/FlutterBuildActionGroup.java

@@ -138,6 +138,11 @@ public void actionPerformed(@NotNull AnActionEvent event) {
         }
       }
     }
+
+    @Override
+    public @NotNull ActionUpdateThread getActionUpdateThread() {
+      return ActionUpdateThread.BGT;
+    }
   }
 
   public static class AAR extends FlutterBuildAction {

flutter-idea/src/io/flutter/actions/OpenInAppCodeAction.java

@@ -11,6 +11,7 @@
 import com.intellij.execution.process.ProcessAdapter;
 import com.intellij.execution.process.ProcessEvent;
 import com.intellij.execution.process.ProcessOutputTypes;
+import com.intellij.openapi.actionSystem.ActionUpdateThread;
 import com.intellij.openapi.actionSystem.AnAction;
 import com.intellij.openapi.actionSystem.AnActionEvent;
 import com.intellij.openapi.actionSystem.Presentation;
@@ -73,6 +74,10 @@ public void update(@NotNull AnActionEvent event) {
     }
   }
 
+  @Override
+  public @NotNull ActionUpdateThread getActionUpdateThread() {
+    return ActionUpdateThread.BGT;
+  }
   @Override
   public void actionPerformed(@NotNull AnActionEvent event) {
     final VirtualFile projectFile = findProjectFile(event);

flutter-idea/src/io/flutter/actions/OpenInXcodeAction.java

@@ -10,10 +10,7 @@
 import com.intellij.execution.process.ColoredProcessHandler;
 import com.intellij.execution.process.ProcessAdapter;
 import com.intellij.execution.process.ProcessEvent;
-import com.intellij.openapi.actionSystem.AnAction;
-import com.intellij.openapi.actionSystem.AnActionEvent;
-import com.intellij.openapi.actionSystem.CommonDataKeys;
-import com.intellij.openapi.actionSystem.Presentation;
+import com.intellij.openapi.actionSystem.*;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.project.ProjectUtil;
 import com.intellij.openapi.util.SystemInfo;
@@ -159,6 +156,11 @@ public void update(@NotNull AnActionEvent event) {
     }
   }
 
+  @Override
+  public @NotNull ActionUpdateThread getActionUpdateThread() {
+    return ActionUpdateThread.BGT;
+  }
+
   @Override
   public void actionPerformed(@NotNull AnActionEvent event) {
     final VirtualFile projectFile = findProjectFile(event);

flutter-idea/src/io/flutter/actions/RunFlutterAction.java

@@ -13,6 +13,7 @@
 import com.intellij.execution.configurations.RunConfiguration;
 import com.intellij.execution.runners.ExecutionEnvironment;
 import com.intellij.execution.runners.ExecutionEnvironmentBuilder;
+import com.intellij.openapi.actionSystem.ActionUpdateThread;
 import com.intellij.openapi.actionSystem.AnAction;
 import com.intellij.openapi.actionSystem.AnActionEvent;
 import com.intellij.openapi.project.Project;
@@ -126,6 +127,11 @@ private static boolean shouldEnable(@Nullable AnActionEvent e) {
     return config instanceof SdkRunConfig && LaunchState.getRunningAppProcess((SdkRunConfig)config) == null;
   }
 
+  @Override
+  public @NotNull ActionUpdateThread getActionUpdateThread() {
+    return ActionUpdateThread.BGT;
+  }
+
   @Nullable
   protected static String getSelectedRunConfig(@Nullable AnActionEvent e) {
     final RunnerAndConfigurationSettings settings = getRunConfigSettings(e);