Fix 53482 : Preserve newline/space behavior (#53732)

Co-authored-by: Andrew Branch <[email protected]>

Author: iinicole

src/compiler/emitter.ts

@@ -4875,7 +4875,10 @@ export function createPrinter(printerOptions: PrinterOptions = {}, handlers: Pri
     }
 
     function emitEmbeddedStatement(parent: Node, node: Statement) {
-        if (isBlock(node) || getEmitFlags(parent) & EmitFlags.SingleLine) {
+        if (isBlock(node) ||
+            getEmitFlags(parent) & EmitFlags.SingleLine ||
+            preserveSourceNewlines && !getLeadingLineTerminatorCount(parent, node, ListFormat.None)
+        ) {
             writeSpace();
             emit(node);
         }

tests/cases/fourslash/preserveSpace.ts

@@ -0,0 +1,84 @@
+/// <reference path="fourslash.ts" />
+
+////function foo() {
+////    /*1*/if (true) console.log(1);
+////    else console.log(1);
+////    if (true)
+////        console.log(1);
+////    else
+////        console.log(1);
+////
+////    do console.log(1);
+////    while (false);
+////    do
+////        console.log(1);
+////    while (false);
+////    
+////    while (true) console.log(1);
+////    while (true)
+////        console.log(1);
+////
+////    for (let i = 1; i < 4; i++) console.log(1);  // 1,2,3
+////    for (let i = 1; i < 4; i++)
+////        console.log(1);  // 1,2,3
+////
+////    for (let i in [1, 2, 3]) console.log(1);
+////    for (let i in [1, 2, 3])
+////        console.log(1);
+////
+////    for (let i of [1, 2, 3]) console.log(1);
+////    for (let i of [1, 2, 3])
+////        console.log(1);
+////
+////    with ([1, 2, 3]) console.log(toString());
+////    with ([1, 2, 3])
+////        console.log(toString());/*2*/
+////}
+
+goTo.select("1", "2");
+edit.applyRefactor({
+  refactorName: "Extract Symbol",
+  actionName: "function_scope_1",
+  actionDescription: "Extract to function in global scope",
+  newContent:
+`function foo() {
+    /*RENAME*/newFunction();
+}
+
+function newFunction() {
+    if (true) console.log(1);
+    else console.log(1);
+    if (true)
+        console.log(1);
+
+    else
+        console.log(1);
+
+    do console.log(1);
+    while (false);
+    do
+        console.log(1);
+    while (false);
+
+    while (true) console.log(1);
+    while (true)
+        console.log(1);
+
+    for (let i = 1; i < 4; i++) console.log(1); // 1,2,3
+    for (let i = 1; i < 4; i++)
+        console.log(1); // 1,2,3
+
+    for (let i in [1, 2, 3]) console.log(1);
+    for (let i in [1, 2, 3])
+        console.log(1);
+
+    for (let i of [1, 2, 3]) console.log(1);
+    for (let i of [1, 2, 3])
+        console.log(1);
+
+    with ([1, 2, 3]) console.log(toString());
+    with ([1, 2, 3])
+    console.log(toString());
+}
+`
+});