Having the same problem. Can reproduce in Qt Creator just like Roman:
* In Qt Creator, open the "Open File or Project" dialog
* Click the Qt Creator icon in Unity launcher to switch to expose view
* notice there are three Qt Creator windows open (main window, open file
dialog, and one small, strange window with frozen content that's probably
supposed to be hidden and can't be closed).
Can also be reproduced using a simple Qt demo app with one MainWindow
(as created by Qt Creator) and something like this in main.cpp (calls to
show() and hide() can be dropped, resulting in the same behaviour):
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
w.hide();
return a.exec();
}
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https://bugs.launchpad.net/bugs/1243239
Title:
Hidden windows of Qt 5 applications are visible
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