- rewrote the panel align heuristics.

leftmost/top panel now always at same location, so switching button
  'main contextes' works consistantly
- fixed some more events to make sure Panels update when editing
- preview render panel now is 320 wide, just for getting the space filled!
- error in preview render matrix, which caused unpredictable drawing errors

Bedtime!

-Ton-

source/blender/src/previewrender.c

@@ -1098,7 +1098,7 @@ void BIF_previewrender(SpaceButs *sbuts)
 		draw_tex_crop(sbuts->lockpoin);
 	
 	glDrawBuffer(GL_BACK);
-	uiPanelPush(block);
+	uiPanelPop(block);
 
 	BIF_previewdraw();