Issue
Selecting the revision pointer and dragging it horizontally doesn't always show the revision data popup.
Steps to reproduce
- Go to a page showing revisions (e.g. https://www.mediawiki.org/w/index.php?diff=2446749&oldid=2428873&title=Extension%3AFlow&type=revision)
- Place the mouse pointer on the "yellow revision pointer" (e.g. ball)
- Click and hold the mouse button
- Move the mouse pointer horizontally towards the left, between different revisions.
Expected
The popup showing revision data appears.
Actual output
Popup isn't always shown for all revisions.
Note: For the first few revisions the popup is actually shown, but when going toward the last few on the left it no longer appears. This also doesn't seem to happen on pages with few revisions.