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Extension not showing up if dialog is fullscreen at load
If you open a dialog (with its filedlgextension), it usually works properly. But you can prevent it from working :
1)open the dialog (with its filedlgextension)
2)double-click the title bar to make it fullscreen
3)close the dialog (cancel or ok, whatever)
4)open the dialog again => the dialog is fullscreen and the extension is not visible