[Freeciv-Dev] (PR#7499) problems with detachable panes

["Vasco Alexandre da Silva Costa" <vasc@xxxxxxxxxxxxxx>]

<URL: http://rt.freeciv.org/Ticket/Display.html?id=7499 >

> [vasc - Tue Feb 24 17:32:02 2004]:
> 
> I think I know why the bug happens. The code used to draw directly to
> 'overview_canvas->window'. Now you copy the pointer to a struct, and use
> that pointer. But what if the pointer value in the original
> 'overview_canvas' was changed uh? Yep. Boom!
> 
> I'm working on a fix.

Yep, that was the bug allright. Confirmed it with a debug printf. Here
is a fix.

overview.diff
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