[Webkit-unassigned] [Bug 153405] [GTK] Implement overlay scrollbars

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=153405

--- Comment #11 from Beth Dakin <bdakin at apple.com> ---
I do want to strongly encourage you to consider making tests. Don't make the same mistake I did!! I assure you that our experience on Mac has been that these behaviors can be subtle enough that we have introduced regressions that took a long time to notice -- I imagine that this will be true for you too. Especially if you support both "legacy" and "overlay" scrollbars (more things to get wrong). Since we have already experienced a number of regressions over the years it feels inevitable to me we will  accidentally break each other's code at some point. All of that will be less painful with tests.

I regret not figuring this out a long time ago, and it still nags at me even though I have a ton of other things to work on. Simon and I were talking today. Maybe there is a way to add tests that just turn on overlay scrollbar logging, and then the scrollbars log something every time they appear or disappear? Or add some way to query current overlay scrollbar state (visible or not, hover-appearance or not, etc)? If you take the lead on fleshing this out, I can implement the Mac support.

Besides this strong encouragement, I also have to insist that you change the name of ScrollAnimatorNone. It seems much more like the presence of scroll animations than the absence! I appreciate the desire to make it more cross-platform-friendly, but I think that ScrollAnimatorGTK would be a much better name.

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