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Vandalism is marked as checked edit after edit conflict
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Description

Steps to reproduce

Consider the following case:

  1. Vandalisms on an article occurs
  2. Another vandalism in a different part of the article occurs
    • At the same time an experienced editor reverts the first bunch of vandalisms
  3. Because of the recently improved edit-conflict prevention, the both changes are saved without an edit conflict
  4. 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
  5. 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

Event Timeline

Dvorapa created this task.May 16 2019, 10:54 AM
Restricted Application added a subscriber: Aklapper. · View Herald TranscriptMay 16 2019, 10:54 AM

The issue is worse if there are two reverts of the same edit conflicting each other, but the authors of the conflicting reverts changed also something else. Thus two reverts of the same edit can silently conflict, which makes ridiculous output (see https://cs.wikipedia.org/w/index.php?title=Jablko&action=history)