Cherry-pick PR microsoft#38599 into release-3.9

Component commits:
428f5a1 delete import comments on organize imports

8003791 add unit test

26eaf70 accept new baseline

81d1732 respond to review comment

Author: Jesse Trinity

src/services/organizeImports.ts

@@ -76,7 +76,7 @@ namespace ts.OrganizeImports {
 
             // Delete any subsequent imports.
             for (let i = 1; i < oldImportDecls.length; i++) {
-                changeTracker.delete(sourceFile, oldImportDecls[i]);
+                changeTracker.deleteNode(sourceFile, oldImportDecls[i]);
             }
         }
     }

src/services/textChanges.ts

@@ -286,6 +286,10 @@ namespace ts.textChanges {
             this.deletedNodes.push({ sourceFile, node });
         }
 
+        public deleteNode(sourceFile: SourceFile, node: Node, options: ConfigurableStartEnd = { leadingTriviaOption: LeadingTriviaOption.IncludeAll }): void {
+            this.deleteRange(sourceFile, getAdjustedRange(sourceFile, node, node, options));
+        }
+
         public deleteModifier(sourceFile: SourceFile, modifier: Modifier): void {
             this.deleteRange(sourceFile, { pos: modifier.getStart(sourceFile), end: skipTrivia(sourceFile.text, modifier.end, /*stopAfterLineBreak*/ true) });
         }

src/testRunner/unittests/services/organizeImports.ts

@@ -592,6 +592,22 @@ import "lib1";
                 { path: "/lib1.ts", content: "" },
                 { path: "/lib2.ts", content: "" });
 
+                testOrganizeImports("SortComments",
+                {
+                    path: "/test.ts",
+                    content: `
+// Header
+import "lib3";
+// Comment2
+import "lib2";
+// Comment1
+import "lib1";
+`,
+                },
+                { path: "/lib1.ts", content: "" },
+                { path: "/lib2.ts", content: "" },
+                { path: "/lib3.ts", content: "" });
+
             testOrganizeImports("AmbientModule",
                 {
                     path: "/test.ts",

tests/baselines/reference/organizeImports/SortComments.ts

@@ -0,0 +1,17 @@
+// ==ORIGINAL==
+
+// Header
+import "lib3";
+// Comment2
+import "lib2";
+// Comment1
+import "lib1";
+
+// ==ORGANIZED==
+
+// Header
+// Comment1
+import "lib1";
+// Comment2
+import "lib2";
+import "lib3";