KDE 5: Do not use native KDE file dialogs unless configured.
In the current state on Arch Linux (qt5-base 5.5.0-1, frameworkintegration 5.12.0-2), the file dialog often hangs (hidden after exec) when the KDE file dialogs are used. To avoid this, the Qt file dialogs are now used. In order to enable the KDE file dialogs, one has to manually set DontUseNativeDialogs=false in the [MainWindow] section of kid3rc (probably in ~/.config/).
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