[2725123] Fixing issue with the tiles window not redrawing properly when it is switched to from another window.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@9659 c06c8d41-db1a-0410-9941-cceddc491573

Created by  ennewalker  on April 19, 2009
3GC4MYJZR7Q5OMX3NPF7S23R5HO47BYBAXYVFZJOFT62G5TMOXIQC
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