Scrollbar width is incorrectly reported in ScrollablePanel when the p… #733

Job	Run time
ios-sfml-graphics	1m 2s
ios-sdl	4m 13s
android-sdl	6m 20s
android-sfml-graphics	2m 44s
linux	5m 2s
linux-latest-dev	4m 19s
linux-oldest	2m 59s
linux-per-backend	5m 37s
macos	2m 6s
windows	3m 11s
windows-clang	5m 27s
windows-oldest	6m 17s
windows-static-mt	5m 50s
nightly-build-windows-visual-studio	8m 13s
	1h 3m 20s

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