Add check for UI thread when using UI controls. #2032
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This should make it easier to troubleshoot programming errors where UI code is accessed from background threads. This includes showing message boxes in background threads, which only works on WPF or WinForms.
There are three modes for
Application.Instance.UIThreadCheckModeNone: Same as before, you won't be notified if you do something wrong things will just not work properlyWarning: You'll get warnings written to the console via Trace.WriteLine, default when not debuggingError: An exception will be thrown, default when a debugger is attachedFixes #2002