[Freeciv-Dev] [Patch] Tile info popup positioning fix (PR#1710)

[Christian Knoke <chrisk@xxxxxxxx>]

When using the middle mouse button on the main map,
to get the tile / unit info popup, the popup is always
beneath the mouse cursor, on the right side. 
That's why, it is cramped, when you click on a tile near 
the right border of the map.

This patch claims to fix it. The popup shows up on the
*left* now, if the cursor is within the right half of the
main map.

Please review.

Christian

-- 
Christian Knoke     * * *      http://www.enter.de/~c.knoke/
* * * * * * * * *  Ceterum censeo Microsoft esse dividendum.

popup-fix1.diff
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