[Freeciv-Dev] (PR#7778) Win32 client: moving a unit locks up mapview

["James Canete" <use_less@xxxxxxxxxxx>]

<URL: http://rt.freeciv.org/Ticket/Display.html?id=7778 >

In the win32 client, built from CVS, moving any unit causes the mapview
to freeze.  Recentering or scrolling doesn't work.

It seems like windows doesn't like mapview_canvas.single_tile. (Macroed
as  single_tile_pixmap) In draw_unit_animation_frame(), anyway.  The
only way I could get it to display correctly when moving a unit was to
make another struct canvas and use it instead of single_tile.  I also
tried just making a bitmap, but it just ended up moving a large black
rectangle around, though it didn't lock up the mapview like CVS.

Here's the patch for the version that creates a new canvas.  I also took
the liberty of replacing all the bitblt calls with canvas_copy calls, so
this could probably eventually be placed into mapview_common.  Though
this might be a bad idea, since this is animation code.

-James Canete

fixfrozenmapwin32.diff
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