Steps to reproduce
Consider the following case:
- Vandalisms on an article occurs
- Another vandalism in a different part of the article occurs
- At the same time an experienced editor reverts the first bunch of vandalisms
- Because of the recently improved edit-conflict prevention, the both changes are saved without an edit conflict
- Because the last revision in article history is a revert of vandalisms by the experienced editor, the last not-reverted vandalism seems to be reverted as well
- Another experienced patrol-group editor marks the last vandalism as checked
Exactly this happened in https://cs.wikipedia.org/w/index.php?title=Judaismus&action=history in May, 15 10:01 CEST
Expected behavior
The quietly solved edit conflict should be A) notes to editors (some popup perhaps) or B) change the order of revisions in edit history in such cases
Current behavior
The vandalism passes quietly
See https://cs.wikipedia.org/wiki/Wikipedie:Pod_l%C3%ADpou_(technika)#Neo%C4%8Dek%C3%A1van%C3%BD_edita%C4%8Dn%C3%AD_konflikt? for more details