The attached changeset speeds up initialization of scrollpanes 
containing horizontal scrollbars by caching scroll range values.

Compared to turning off horz scrollbars altogether, "Browser 
openBrowser" is still about 70ms slower, and "Browser fullOnClass: 
Browser selector: openBrowser" is about 120ms slower. A signifigant 
speedup nonetheless with a penalty analagous to turning rounded window 
corners on.

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