Steps to reproduce:

1. Forward navigation
   • Resize your browser window and make it very narrow, e.g. half the screen.
   • Go to any page history, open any diff, enable the RevisionSlider, and ideally pin it.
   • Now make the browser window larger, i.e. trigger at least one resize event.
   • Click the "Previous edit" link.
   • Unexpected behavior: Instead of jumping 1 revision the slider starts to a random position multiple revisions away.
2. Backward navigation
   • Resize your browser window and make it very narrow, e.g. half the screen.
   • Go to any page history, open any diff, enable the RevisionSlider, and ideally pin it.
   • Click the "Previous edit" link multiple times.
   • Now make the browser window larger, i.e. trigger at least one resize event.
   • Now use the browser's back button.
   • Unexpected behavior: Instead of jumping 1 revision the slider starts to a random position multiple revisions away.

Marking as a Regression because I believe this was not an issue before T139101.