Found while checking T273118 on wmf.33.
I checked several wikis - ruwiki, kowiki, svwiki, and testwiki - the issue was present there.
- On Special:Homepage click on "Ask your mentor a question" in the Mentorship module.
- The popup panel - "Ask your mentor" - will be displayed shorter than before and the panel will have a vertical scrolling.
<div class="oo-ui-window-frame" style="transition: all 0.25s ease-out 0s; width: 500px; height: 280px;">
The issue is not present on cswiki wmf.33
<div class="oo-ui-window-frame" style="transition: all 0.25s ease-out 0s; width: 500px; height: 410px;">