5616bbd45b
Currently we update the scale factor on startup and when we get a monitors-changed signal, which is not the only cases where the setting changes. We cannot listen for gdk-window-scaling-factor changes because it is not exported to gdk. So use gtk-xft-dpi which also indicates a scale factor change. When someone changes gtk-xft-dpi directly without changing the scale factor we will just re-read the gdk-window-scaling-factor so no harm is done. https://bugzilla.gnome.org/show_bug.cgi?id=726238
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