Minor optimization of drawing code in OSX
All on Tk/Cocoa: Improve view performance during resizing; implement custom drawing of scroller to remove flickering and ghosted appearance during window operations; reduce flickering of menubutton during resizing, but do not completely eliminate ghosted rendering when widget is unmapped
Add method to tkMacOSXButton.c
Refinement of custom scrollbars on Tk-Cocoa; now more centered, virtually identical to scrollbars in Safari, etc.
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