39345212e8
Context IDs are dependant on the display - both because displays can use
different backends, but also because changing the GtkSetting is a
per-display operation.
So just remove the cache.
If it turns out we need a per-display cache, we can add one to
GtkSettings.
(cherry picked from commit 16d4ce4d03
with slight changes to use priv->client_window instead of
priv->client_widget)
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