make codepaths more async.

src/Workspaces/Core/Portable/Formatting/Formatter.cs

@@ -85,7 +85,7 @@ public static async Task<Document> FormatAsync(Document document, OptionSet opti
             }
 
             var root = await document.GetSyntaxRootAsync(cancellationToken).ConfigureAwait(false);
-            return document.WithSyntaxRoot(Format(root, document.Project.Solution.Workspace, options, cancellationToken));
+            return document.WithSyntaxRoot(await FormatAsync(root, document.Project.Solution.Workspace, options, cancellationToken).ConfigureAwait(false));
         }
 
         /// <summary>

src/Workspaces/Core/Portable/Workspace/Workspace.cs

@@ -1194,7 +1194,7 @@ private ProjectInfo CreateProjectInfo(Project project)
 
         private SourceText GetTextForced(TextDocument doc)
         {
-            return doc.GetTextAsync(CancellationToken.None).WaitAndGetResult(CancellationToken.None); // needs wait (called during TryApplyChanges)
+            return doc.GetTextAsync(CancellationToken.None).WaitAndGetResult_CanCallOnBackground(CancellationToken.None); // needs wait (called during TryApplyChanges)
         }
 
         private DocumentInfo CreateDocumentInfoWithText(TextDocument doc)

src/Workspaces/CoreTest/WorkspaceTests/MSBuildWorkspaceTests.cs

@@ -2956,4 +2956,4 @@ public Assembly LoadFromPath(string fullPath)
             }
         }
     }
-}
+}
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