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Under X11 we can only ever have the same scale configured on all monitors. In order to use e.g. scale 2 when there is a HiDPI monitor connected, we must not disallow it because there is a monitor that does not support scale 2. Thus we must show the same scale for every monitor and monitor mode, even though it might result in a bad experience. Do this by iterating through all the monitors adding all supported scales by the preferred mode, combining all the supported scales. This supported scales list is then used for all monitor and modes no matter what. https://bugzilla.gnome.org/show_bug.cgi?id=788901