With a dark theme applied that uses the sidebar colours and then switching to a light theme using the sidebar colours, the lwt-tree-brighttext attribute isn't removed.
This is a port of https://hg.mozilla.org/integration/autoland/rev/a2b59c32f04d You don't see a difference now when switching from dark theme to WE-Nuvola actually because we don't use such visible elements. I'll attach a patch to show themed scrollbars in the folderPane tree there you will see the effect.
This patch will land in a new bug but isn't ready because under Windows the scrollbar arrows are almost or not visible and I wait for the fix in bug 1485599 to follow.
Comment on attachment 9020602 [details] [diff] [review] 1502722-lwt-tree-variable-cleanup.patch This looks very reasonable by code inspection, especially as a port. Sorry, I didn't test it.
Pushed by firstname.lastname@example.org: https://hg.mozilla.org/comm-central/rev/4a6558329193 Port bug 1501586 to TB: Clean up lwt-*-brighttext attributes properly when switching from a dark theme to a light theme. r=jorgk
Status: ASSIGNED → RESOLVED
Closed: Last year
Resolution: --- → FIXED
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