{"action":"created","comment":{"url":"https://api.github.com/repos/dotnet/roslyn/pulls/comments/41792592","id":41792592,"diff_hunk":"@@ -125,8 +125,34 @@ protected override void SetupNewTextView(IVsTextView textView)\n             var openDocument = wpfTextView.TextBuffer.AsTextContainer().GetRelatedDocuments().FirstOrDefault();\n             var isOpenMetadataAsSource = openDocument != null && openDocument.Project.Solution.Workspace.Kind == WorkspaceKind.MetadataAsSource;\n \n+            ConditionallyCollapseOutliningRegions(textView, wpfTextView, optionsService, isOpenMetadataAsSource);\n+\n+            // If this is a metadata-to-source view, we want to consider the file read-only\n+            IVsTextLines vsTextLines;\n+            if (isOpenMetadataAsSource && ErrorHandler.Succeeded(textView.GetBuffer(out vsTextLines)))\n+            {\n+                ((IVsTextBuffer)vsTextLines).SetStateFlags((uint)BUFFERSTATEFLAGS.BSF_USER_READONLY);\n+\n+                var runningDocumentTable = (IVsRunningDocumentTable)SystemServiceProvider.GetService(typeof(SVsRunningDocumentTable));\n+                var runningDocumentTable4 = (IVsRunningDocumentTable4)runningDocumentTable;\n+\n+                if (runningDocumentTable4.IsMonikerValid(openDocument.FilePath))\n+                {\n+                    var cookie = runningDocumentTable4.GetDocumentCookie(openDocument.FilePath);\n+                    runningDocumentTable.ModifyDocumentFlags(cookie, (uint)_VSRDTFLAGS.RDT_DontAddToMRU | (uint)_VSRDTFLAGS.RDT_CantSave, fSet: 1);\n+                }\n+            }\n+        }\n+\n+        private void ConditionallyCollapseOutliningRegions(IVsTextView textView, IWpfTextView wpfTextView, IOptionService optionsService, bool isOpenMetadataAsSource)\n+        {\n             var outliningManagerService = this.Package.ComponentModel.GetService<IOutliningManagerService>();\n             var outliningManager = outliningManagerService.GetOutliningManager(wpfTextView);\n+            if (outliningManager == null)","path":"src/VisualStudio/Core/Def/Implementation/LanguageService/AbstractLanguageService`3.cs","position":27,"original_position":27,"commit_id":"91334863ed77ffdc298f367de29ce32a1255dc7b","original_commit_id":"91334863ed77ffdc298f367de29ce32a1255dc7b","user":{"login":"jasonmalinowski","id":201340,"avatar_url":"https://avatars.githubusercontent.com/u/201340?v=3","gravatar_id":"","url":"https://api.github.com/users/jasonmalinowski","html_url":"https://github.com/jasonmalinowski","followers_url":"https://api.github.com/users/jasonmalinowski/followers","following_url":"https://api.github.com/users/jasonmalinowski/following{/other_user}","gists_url":"https://api.github.com/users/jasonmalinowski/gists{/gist_id}","starred_url":"https://api.github.com/users/jasonmalinowski/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/jasonmalinowski/subscriptions","organizations_url":"https://api.github.com/users/jasonmalinowski/orgs","repos_url":"https://api.github.com/users/jasonmalinowski/repos","events_url":"https://api.github.com/users/jasonmalinowski/events{/privacy}","received_events_url":"https://api.github.com/users/jasonmalinowski/received_events","type":"User","site_admin":false},"body":"If you didn't already, can you do a quick find refeernces on GetOutliningManager and see if we have any other offenders? This is news to me that it can be null. :-)","created_at":"2015-10-12T19:35:27Z","updated_at":"2015-10-12T19:35:27Z","html_url":"https://github.com/dotnet/roslyn/pull/5892#discussion_r41792592","pull_request_url":"https://api.github.com/repos/dotnet/roslyn/pulls/5892","_links":{"self":{"href":"https://api.github.com/repos/dotnet/roslyn/pulls/comments/41792592"},"html":{"href":"https://github.com/dotnet/roslyn/pull/5892#discussion_r41792592"},"pull_request":{"href":"https://api.github.com/repos/dotnet/roslyn/pulls/5892"}}},"pull_request":{"url":"https://api.github.com/repos/dotnet/roslyn/pulls/5892","id":47451819,"html_url":"https://github.com/dotnet/roslyn/pull/5892","diff_url":"https://github.com/dotnet/roslyn/pull/5892.diff","patch_url":"https://github.com/dotnet/roslyn/pull/5892.patch","issue_url":"https://api.github.com/repos/dotnet/roslyn/issues/5892","number":5892,"state":"open","locked":false,"title":"OutliningManager can be null (when outlining is disabled).  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