The issue is caused by the X-Window server (or Qt). When the calendar popup is
requested, it is created and want to gain exclusive focus. At the same time the
editing finished signal is sent and that fires the breakpoint. This causes eric to
request the mouse and keyboard inputs and we have a deadlock situation. The same
happens, when setting a breakpoint in a menu handling function. This situation
does not happen on every OS (e.g. doesn't happen on Windows). Therefore I don't
consider it an eric issue. However, if a workaround is known, I am happy to
implement it.
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