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Dialog opening transforms are not animated in Firefox, weird 'undefined' transition is set
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Description

Dialog (any) opening/closing transforms are not animated in Firefox.
In the style attribute for <div class="oo-ui-window-frame"> there is transition: undefined 0s ease 0s. Something goes wrong in Window#withoutSizeTransitions, maybe? Noticed when investigating T135808.

Event Timeline

Simple Dialog (full) from the demos gets a transition applied in contrast to all other Simple Dialogs.

Change 311986 had a related patch set uploaded (by Prtksxna):
Window#withoutSizeTransitions: Build transition property using sub-properties

https://gerrit.wikimedia.org/r/311986

Prtksxna triaged this task as Medium priority.
Prtksxna moved this task from Backlog to Doing on the OOUI board.

Change 311986 merged by jenkins-bot:
Window#withoutSizeTransitions: Build transition property using sub-properties

https://gerrit.wikimedia.org/r/311986

Jdforrester-WMF moved this task from Doing to OOjs-UI-0.18.0 on the OOUI board.
Jdforrester-WMF edited projects, added OOUI (OOjs-UI-0.18.0); removed OOUI.
Jdforrester-WMF removed a project: Patch-For-Review.