WebUI: fix incorrect behavior of ESC button on combobox #368
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When combobox is opened then ESC key should close it. There was a bug
that ESC key closed also the dialog. It was caused by bad keyboard event
handling. The CB was closed by keydown event and the dialog by keyup.
Therefore the propagating of keyup and keydown event is stopped when CB
is opened (when the event is fired on CB element).
https://fedorahosted.org/freeipa/ticket/6388