I would have noticed this a while ago, but I have been using Yaru, and Yaru's scrollbars are *very* similar to Adwaita. Steps to reproduce: 1. Install Plata theme: https://gitlab.com/tista500/plata-theme 2. Enable "Plata Lumine" in GNOME Tweaks 3. Open Firefox and any web page What happens: The scrollbars that appear in the browser chrome are using what looks to be Adwaita. Expected result: Non-curved scrollbars from Plata. 123:54.06 INFO: No more integration revisions, bisection finished. 123:54.06 INFO: Last good revision: 92111df0dbd94e41565c0d65b52116579f37b032 123:54.06 INFO: First bad revision: 167a564b3fda4eb8f853b3b69abbe31db671e1a5 123:54.06 INFO: Pushlog: https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=92111df0dbd94e41565c0d65b52116579f37b032&tochange=167a564b3fda4eb8f853b3b69abbe31db671e1a5 This appears to be regressed by bug 1527048, and from my reading of that bug, this is unexpected behavior, since Plata Lumine is not a "dark theme". More interestingly, if a user sets "Yaru", a close inspection shows that it doesn't actually look like Yaru is being used for the scrollbar -- in Yaru, the scrollbar "well" is invisible, while the one shown in Firefox today is gray. My guess is that this is actually Adwaita.
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I would have noticed this a while ago, but I have been using Yaru, and Yaru's scrollbars are *very* similar to Adwaita. Steps to reproduce: 1. Install Plata theme: https://gitlab.com/tista500/plata-theme 2. Enable "Plata Lumine" in GNOME Tweaks 3. Open Firefox and any web page What happens: The scrollbars that appear in the browser chrome are using what looks to be Adwaita. Expected result: Non-curved scrollbars from Plata. 123:54.06 INFO: No more integration revisions, bisection finished. 123:54.06 INFO: Last good revision: 92111df0dbd94e41565c0d65b52116579f37b032 123:54.06 INFO: First bad revision: 167a564b3fda4eb8f853b3b69abbe31db671e1a5 123:54.06 INFO: Pushlog: https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=92111df0dbd94e41565c0d65b52116579f37b032&tochange=167a564b3fda4eb8f853b3b69abbe31db671e1a5 This appears to be regressed by bug 1527048, and from my reading of that bug, this is unexpected behavior, since Plata Lumine is not a "dark theme". More interestingly, if a user sets "Yaru", a close inspection shows that it doesn't actually look like Yaru is being used for the scrollbar -- in Yaru, the scrollbar track is invisible, while the one shown in Firefox today is gray. My guess is that this is actually Adwaita.