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gtk_init: Fix debug flags handling when a display is already open

Christoph Reiter requested to merge creiter/gtk:gtk-debug-flags-with-open-display-master into master

The code assigning the display to the debug_flags struct gets only called when the default display changes, which never happens when there already is one.

This makes it call the change callback in case a display is already there.

The same fix was applied to gtk3 in !26 (merged) where calling gdk_init() before gtk_init() would trigger this case. With gdk_init() gone in master this is less likely to happen, but still possible if gdk_display_open() is called before gtk_init().

See pygobject#166 (closed)

Edited by Christoph Reiter

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