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Hello, I observe that syntax editor shows incorect vertical scrollbar when some regions in a code are collapsed.
Please see this screenshot for details - the thumb has very small hight for displayed text amount:
https://www.dropbox.com/s/rrfrm54wzmsu0bd/scrollbar.png?dl=0
It is just SyntaxEditor with loaded file:
https://www.dropbox.com/s/4xj89yogvsaqryt/Application.cs?dl=0
Version 2016 doesn't have this issue and it calculates thumb size correctly.