Priority: P2: Important
Affects Version/s: 5.3.0, 5.15
Fix Version/s: None
Please have a look at the stack trace's picture.
I get a crash in my application because some code of mine, dependent on user input, is called at unexpected time.
The typical scenario is when a widget is shown. This causes the event queue, including user events, to be flushed. We certainly don't expect user events to be processed when "setVisible" is called on a widget.
I get this on Mac, but got it once on Windows too (in this case, a tip window move caused the flushing).
I see this as a design flaw (never had this in Qt 4.8): the user input events should not be flushed when showing a window, and actually in most contexts.
should have a QEventLoop::ProcessEventsFlag argument, just as sendWindowSystemEvents has.
|For Gerrit Dashboard: QTBUG-39842|
|88461,1||Don't flush user input events from setVisible||5.3||qt/qtbase||Status: ABANDONED||0||0|
|97696,4||QPA: Flush window system events with flags.||5.4||qt/qtbase||Status: MERGED||+2||0|
|97697,4||Don't flush user input events from setVisible||5.4||qt/qtbase||Status: MERGED||+2||0|
|160988,10||Windows QPA: Call QWSI::flushWindowSystemEvents() from WM_PAINT for full update only||5.9||qt/qtbase||Status: MERGED||-2||0|
|161096,3||Remove tst_QWidget::immediateRepaintAfterShow().||5.6||qt/qtbase||Status: MERGED||+2||0|
|161369,4||Windows QPA: Pass ExcludeUserInputEvents to QWSI::flushWindowSystemEvents()||5.6||qt/qtbase||Status: MERGED||+2||0|
|183862,1||Windows QPA: Call QWSI::flushWindowSystemEvents() from WM_PAINT for full update only||dev||qt/qtbase||Status: ABANDONED||0||0|