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Check for stopped propagation before showing close dialog

Description

Check for stopped propagation before showing close dialog

Various VE elements use escape to perform tasks. Particularly
difficult are OOUI dialogs which listen to the document and thus
fire after this target's listener, so defer and check if the
event was previously stopped.

Bug: T78201
Change-Id: Ie335f199766923833588202626c3af8e4cbcb9b5

Details