Fix: Doubled members of project types in Class Browser.

src/Main/Base/Project/Parser/ProjectContentContainer.cs

@@ -246,7 +246,8 @@ namespace ICSharpCode.SharpDevelop.Parser
 						projectContent = projectContent.RemoveFiles(oldFile.FileName);
 					serializedProjectContentIsUpToDate = false;
 					SD.ParserService.InvalidateCurrentSolutionSnapshot();
-					SD.MainThread.InvokeAsyncAndForget(delegate { assemblyModel.Update(oldFile, newFile); });
+					if (!SD.ParserService.LoadSolutionProjectsThread.IsRunning)
+						SD.MainThread.InvokeAsyncAndForget(delegate { assemblyModel.Update(oldFile, newFile); });
 				}
 			}
 		}