roslyn: Gold bar with exception in VisualStudioWorkspaceImpl.EnsureEditableDocuments when renaming a type (with rename file)

Version Used: Latest 16.7 dogfood build

Also reported AB#1243307

Steps to Reproduce:

1. Open Compilers.sln from Roslyn repo
2. Attempt to invoke rename type (with rename file) while solution is still loading

Call stack:

System.Exception: Unable to check out the files from source control.

   at Microsoft.VisualStudio.LanguageServices.Implementation.ProjectSystem.VisualStudioWorkspaceImpl.EnsureEditableDocuments(IEnumerable`1 documents)

   at Microsoft.VisualStudio.LanguageServices.Implementation.ProjectSystem.VisualStudioWorkspaceImpl.ApplyTextDocumentChange(DocumentId documentId, SourceText newText)

   at Microsoft.VisualStudio.LanguageServices.Implementation.ProjectSystem.VisualStudioWorkspaceImpl.ApplyDocumentTextChanged(DocumentId documentId, SourceText newText)

   at Microsoft.CodeAnalysis.Workspace.ApplyChangedDocument(ProjectChanges projectChanges, DocumentId documentId)

   at Microsoft.CodeAnalysis.Workspace.ApplyProjectChanges(ProjectChanges projectChanges)

   at Microsoft.CodeAnalysis.Workspace.TryApplyChanges(Solution newSolution, IProgressTracker progressTracker)

   at Microsoft.VisualStudio.LanguageServices.Implementation.ProjectSystem.VisualStudioWorkspaceImpl.TryApplyChanges(Solution newSolution, IProgressTracker progressTracker)

   at Microsoft.CodeAnalysis.Workspace.TryApplyChanges(Solution newSolution)
   at Microsoft.CodeAnalysis.Editor.Implementation.InlineRename.InlineRenameSession.ApplyRename(Solution newSolution, IWaitContext waitContext)

   at Microsoft.CodeAnalysis.Editor.Implementation.InlineRename.InlineRenameSession.CommitCore(IWaitContext waitContext, Boolean previewChanges)

   at Microsoft.CodeAnalysis.Editor.Implementation.InlineRename.InlineRenameSession.<>c__DisplayClass78_0.<CommitWorker>b__0(IWaitContext waitContext)

   at Microsoft.VisualStudio.LanguageServices.Implementation.Utilities.VisualStudioWaitIndicator.Wait(String title, String message, Boolean allowCancel, Boolean showProgress, Action`1 action)

   at Microsoft.CodeAnalysis.Editor.Implementation.InlineRename.InlineRenameSession.CommitWorker(Boolean previewChanges)

   at Microsoft.CodeAnalysis.Editor.Implementation.InlineRename.RenameCommandHandler.ExecuteCommand(ReturnKeyCommandArgs args, CommandExecutionContext context)

   at Microsoft.VisualStudio.UI.Text.Commanding.Implementation.EditorCommandHandlerService.<>c__DisplayClass14_1`1.<ExecuteStartingAtIndex>b__0()

   at Microsoft.VisualStudio.Text.Utilities.GuardedOperations.CallExtensionPoint(Object errorSource, Action call, Predicate`1 exceptionFilter)

--- End of stack trace from previous location where exception was thrown ---

   at Microsoft.VisualStudio.Telemetry.WindowsErrorReporting.WatsonReport.GetClrWatsonExceptionInfo(Exception exceptionObject)</description>
  </entry>