[PATCH] BUG: 182325 Crash in KDatePicker selectYearClicked()

[Christoph Feck]

Hello,

Commit r834444 tried to fix the outside click issue using WA_DeleteOnClose. 
The problem is that clicking outside of the year popup causes the widget to 
be deleted without leaving the event loop. Then later when the application 
exits, the KPopupFrame::exec() calls hide() on the already deleted widget.
(To reproduce the crash, open systemsettings -> Date&Time, click on the year, 
click outside the year field that pops up, then close systemsettings.)

This patch reverts r834444 and tries to fix it the right way.

I am posting this for review because of two reasons:

1) Not sure if adding the hideEvent() handler to KPopupFrame is binary 
compatible. AFAICT only recompiled subclasses benefit from the fix.

2) The source somehow mentions[1] that KPopupFrame is used in multiple code 
places, but I was not able to find any other location that would need a 
similar fix. Anyone in the know? (note [1]: kdatetable.cpp, line 832)

Thanks,
Christoph Feck (kdepepo)

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