TL;DR: We believe this ticket isn't about a single issue but an unfortunate mixture of a (new?) browser bug, a skin that didn't exist when RevisionSlider was created, and several fragile pieces of code in RevisionSlider that respond poorly to said browser bug and some of the new features the skin introduced. You can find many more details in the linked Gerrit patches.
Steps to reproduce:
- Go to an example diff like https://he.wikipedia.org/wiki/Special:Diff/37434768?uselang=he.
- Use the new Desktop Improvements (Vector 2022), if possible. While the issue appears to be mostly unrelated to the skin, we found it's easier to reproduce in the new Vector. Note hewiki is among the test wikis that got the new Vector very early. See T254227. That's why this issue might be relevant especially for hewiki users.
- Make sure your interface language is actually an RTL one, not English.
- Make sure your browser zoom is >100% and/or you have the tools menu expanded (it's on the left side because of RTL).
- Try to click the bars. It will not jump to that position, or even crash with a Cannot read properties of undefined (reading 'top') at SliderView.revisionsClickHandler.
Early tests made it look like this is related to the pinned tools menu on the left. Just collapsing all menus made RevisionSlider work again.
At least on hewiki the TOC in the sidebar seems to be expanded by default, which means the issue is potentially visible to all anonymous users on hewiki.
Later tests showed that parts of the issue can only be reproduced when the browser zoom is >100%. But not all zoom factors are affected (see https://gerrit.wikimedia.org/r/1007329 for details). The issue is known but appears to have a very low chance of ever being fixed, see https://issues.chromium.org/issues/41417874 and the underlying issue https://issues.chromium.org/issues/40384509.
Screen width seems to play a role as well. A page with only a few revisions doesn't have problems. No problem on very large screens. When you zoom in or make the browser window more narrow the issue is much easier to reproduce.
Reported here: https://www.mediawiki.org/wiki/Topic:Xuaj7i4ajtzj3pem