Notify user when closing tab/window with ongoing scan

WazeDev / WME_Wide-Angle_Lens

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Notify user when closing tab/window with ongoing scan #23

Closed crazycaveman closed 5 years ago

crazycaveman commented 5 years ago

When closing tab while scanning, prompt user if they want to cancel the scan, similar to WME prompting when there are unsaved changes. Requested by: @whathappened15