Refactor|Busy Mode: Don't block the UI event loop when busy
Busy mode will run a local event loop and continue to process UIevents normally. Partially refactoring busy mode to a BusyTask class.
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Refactor|Busy Mode: Don't block the UI event loop when busy
Busy mode will run a local event loop and continue to process UI
events normally. Partially refactoring busy mode to a BusyTask class.