Follow-up Comment #47, patch #2715 (project freeciv):
It's what I said in comment #35 - I seem to be getting the clip region wrong
- simply commenting gdk_cairo_region call in science_diagram_update makes it
work as before, but it would be nice to get the clip right (I am working on
it, but today I had a completely different topic on schedule).
But still, the most outstanding issue is the overview leak, I wrote about in
comment #41. The catch is that overview doesn't give access to its store (at
least it seems that way), so I can't explicitly draw upon it in the expose
callback. The other way around is also a no go, as there's no
release_overview_window counterpart of get_overview_window.
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