Block the clipboard signals while showing the file dialogs
The GTK native file dialogs, when you copy a file name (with ctrl-c) do something really horrible to the clipboard. This will cause a hang if the app connects to the QClipBoard signals. See: https://bugreports.qt-project.org/browse/QTBUG-11187 However, https://bugreports.qt-project.org/browse/QTBUG-32853 might still occur: that is, if the user tries to copy the filename, there'll be a delay on closing the app, and an error message on stderr: QClipboard: Unable to receive an event from the clipboard manager in a reasonable time BUG:325949
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