mono/monodevelop — pull request #534 by DavidKarlas (2014-05-08 09:30:24+00:00)
Title: [Debugger] ThreadPad only load threads when visible

This approach for checking if visible and refreshing is taken from StacktracePad: https://github.com/mono/monodevelop/blob/master/main/src/addins/MonoDevelop.Debugger/MonoDevelop.Debugger/StackTracePad.cs#L164