Hi,
System scrollbar theme is no longer supported, sorry.
This feature was already limited to the deprecated GTK 3 API versions,
since GTK 4 doesn't support foreign drawing of GTK widgetry. So modern
apps already have no native scrollbars unfortunately; they only work in
legacy GTK 3 apps.
Then 2.46 switched from Cairo to Skia for rendering, and native
scrollbars were just never implemented when using Skia. I don't
understand graphics and don't know the details about why, but I think
it's got something to do with performance. I think using GTK forces web
view rendering to use only one thread instead of many threads?
Sorry for the bad news,
Michael
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