[Bug 41560] BCGPVisualStudioGUIDemo.exe example fails to draw Themed Scrollbars

https://bugs.winehq.org/show_bug.cgi?id=41560

--- Comment #9 from Nikolay Sivov  ---
I see that Solution Explorer panel scrollbar is always standard. While Start
Page one is always themed, unless you resize it quickly enough to see standard
one repainted with a custom one. Not sure how if it's related yet, but Solution
Explorer scrollbar works a bit differently on Windows too, if you make the
panel narrow enough, scroll bar does not correctly repaint on window resize,
instead you have to move mouse over it to update scroll thumb width. Could you
attach diff you used to make it work?