New filter targeted at desk_googlespreadsheet overdraw issues

This picture record optimization addresses some of the toolbar button overdraw issues in desk_googlespreadsheet.

Here is when it fires:
    Executing desk_googlespreadsheet.skp	0: 9
    Executing desk_googlespreadsheetdashed.skp	0: 9

Here is the performance impact (left is old; right is new)

desk_googlespreadsheetdashed.skp tile_256x256_gpu c 75.61      71.05      +4.56    +6.0% 
desk_googlespreadsheet.skp tile_256x256_gpu c       12.72      10.51      +2.21   +17.4% 

desk_googlespreadsheetdashed.skp tile_256x256 c	    22.82      19.75      +3.07   +13.5% 
desk_googlespreadsheet.skp tile_256x256 c            6.78          4.64      +2.14    +31.6%

[djsollen, 2013-03-28 00:43:00]

lgtm

[robertphillips, 2013-03-28 12:25:42]

committed as r8424