Try to mitigate code folding test failures

Code folding is one of the earliest LSP requests we get, and unlike semantic tokens we don't have an opportunity to tell the client we are ready to answer them. Hopefully a wait and a text change will improve the tests.

Author: davidwengier

src/Razor/test/Microsoft.VisualStudio.Razor.IntegrationTests/CodeFoldingTests.cs

@@ -123,7 +123,7 @@ static CollapsibleBlock ConvertToLineNumbers(Span span, ITextView textView)
         }
     }
 
-    [IdeFact(Skip = "Flaky after multitarget work")]
+    [IdeFact]
     public async Task CodeFolding_CodeBlock()
     {
         await TestServices.SolutionExplorer.AddFileAsync(
@@ -147,6 +147,10 @@ private void IncrementCount()
             open: true,
             ControlledHangMitigatingCancellationToken);
 
+        await TestServices.Editor.WaitForComponentClassificationAsync(ControlledHangMitigatingCancellationToken);
+
+        TestServices.Input.Send("{ENTER}");
+
         await AssertFoldableBlocksAsync(
 @"@code {
     private int currentCount = 0;
@@ -190,6 +194,10 @@ await TestServices.SolutionExplorer.AddFileAsync(
             open: true,
             ControlledHangMitigatingCancellationToken);
 
+        await TestServices.Editor.WaitForComponentClassificationAsync(ControlledHangMitigatingCancellationToken);
+
+        TestServices.Input.Send("{ENTER}");
+
         await AssertFoldableBlocksAsync(
 @"@if(true)
 {
@@ -232,6 +240,10 @@ await TestServices.SolutionExplorer.AddFileAsync(
             open: true,
             ControlledHangMitigatingCancellationToken);
 
+        await TestServices.Editor.WaitForComponentClassificationAsync(ControlledHangMitigatingCancellationToken);
+
+        TestServices.Input.Send("{ENTER}");
+
         await AssertFoldableBlocksAsync(
 @"@foreach (var s in GetStuff())
 {
@@ -265,6 +277,10 @@ void M2() { }
             open: true,
             ControlledHangMitigatingCancellationToken);
 
+        await TestServices.Editor.WaitForComponentClassificationAsync(ControlledHangMitigatingCancellationToken);
+
+        TestServices.Input.Send("{ENTER}");
+
         await AssertFoldableBlocksAsync(
 @"#region Methods
     void M1() { }