The menu-vertical binding (bound to menulist[type=description]) appears to be unused in m-c: https://searchfox.org/mozilla-central/search?q=type%3D%22description%22&path=xul The binding, along with any associated CSS can be removed: https://searchfox.org/mozilla-central/search?q=menulist-description&path=. Note that there is a single consumer in comm-central, so either that will have to become a plain menulist or the binding will need to be migrated there to continue working: https://searchfox.org/comm-central/search?q=type%3D%22description%22&path=xul. It appears that the difference (some extra flex and different styling) could be migrated as CSS-only and not require porting the binding.
Assignee: nobody → 36198
Status: NEW → ASSIGNED
Orange looks unrelated: https://treeherder.mozilla.org/#/jobs?repo=try&revision=bfc207ab55685a23d863b6779ee7a3c6f8f7ceef
Attachment #8944590 - Flags: review?(bgrinstead) → review+
Pushed by firstname.lastname@example.org: https://hg.mozilla.org/integration/mozilla-inbound/rev/efb319fac7c3 Removed the unused menulist-description binding r=bgrins
Moving to Core:XUL per https://bugzilla.mozilla.org/show_bug.cgi?id=1455336
Component: XP Toolkit/Widgets: XUL → XUL
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