Adds addtional improvements to HorizontalSplitPanel and VerticalSplitPanel.
The changes include:

1 - Limited styling on container elements to work around Safari2 bug with
percentage heights.

2 - Added thumb images to each of the split panels (via ImageBundle).

3 - Reworked VerticalSplitPanel to be more like HorizontalSplitPanel.

4 - Refactored most of the utility methods into static methods inside of
SplitPanel.

5 - Added mouse move event coalescing to the IE6/7 impl to make repaints less
choppy.

Review by: jgw



git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@1319 8db76d5a-ed1c-0410-87a9-c151d255dfc7
8 files changed