Maximizing a ribbon window does not work correctly if the task bar is positioned at the left or top of the screen. Add a workaround for this.

git-svn-id: http://tortoisesvn.googlecode.com/svn/trunk/src/TortoiseMerge@24379 4cfb86a4-2c7a-11df-bd14-c1e331e6ceac
ran tabspace task.

git-svn-id: http://tortoisesvn.googlecode.com/svn/trunk/src/TortoiseMerge@24384 4cfb86a4-2c7a-11df-bd14-c1e331e6ceac