#57 external close calendar window don't set dc->calendar_window

6.1
open
nobody
bug fix (11)
5
2011-06-16
2011-06-16
bercik-rrp
No

When calendar is close from window manager (e.g. Alt+F4) dc->calendar_window is not set to NULL, As a result of this:
1) tooltips don't work
2) to open calendar need two click on clock
This patch add handler for "delete-event" signal where is destroy callendar window and set dc->calendar_window to NULL.

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