GtkFontChooserWidget: Listen for fontconfig changes
We were relying on indirectly getting notify when fontconfig configuration changes, by GtkSettings translating the timestamp change into a style-invalidation, which gets fed through the css invalidation machinery. That machinery has gotten good enough at optimizing away redundant changes that it no longer emits ::style-updated in this case. So, instead make the font chooser listen directly to what it cares about: the fontconfig change notification from GtkSettings.
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