Increase the gap size in the minimap

A more robust solution would be to take the increased gap size out of the
clones' size by applying the necessary scaling. Leaving the clone
container at the same scale as the minimap viewport will then make coordinates
from the original windows translate properly.

minimap.js

@@ -206,7 +206,7 @@ Minimap = new Lang.Class({
             propagate_forward(i+1, x + w + gap, gap);
         }
 
-        propagate_forward(0, 0, window_gap);
+        propagate_forward(0, 0, 5*window_gap);
     },
 
     reorder: function(index, targetIndex, targetX) {