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That's a standard part of Gnome! Gnome's Console and Web browser also use it, plus some third-party apps like Wike.

The big difference here from Console is that Prompt will do custom snapshotting for the TabOverview to make it fast. Otherwise it thrashes the glyph cache.

Of course, I also wrote the glyph cache for GTK, but it's just not something I can fix there.

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