When having 2 (or more) users editing the same thing at the same time (e.g. a task description), the last person who saved (almost?) always overwrite all changes, silently, and this is a problem.

Minimal steps to reproduce to simulate an edit conflict:

1. open a task in 2 tabs (also from same session)
2. in tab 1: set title, description, tags, subscribers (and other things) to "foo" (don't save)
3. in tab 2: set title, description, tags, subscribers (and other things) to "bar" (don't save)
4. from tab 1, save
5. from tab 2: save

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What happens:

• the last editor overwrote all changes (now task 1 has "bar" everywhere)
• the log is a mess, where "foo" was successfully saved, but then rolled back and overwrote by "bar"

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What should happen instead (minimal viable solution):

• The last user is informed that an edit conflict happened

Bonus point:

• User can easily see what changed before, and can see again what they will set if they force save
• User can decide to "Force save" (to do just what happened before silently...)

Super bonus point:

• User can easily fix the edit conflict, looking at A, looking at B, and saving C

Edit Conflict in Other Collaborative Platforms

https://www.mediawiki.org/wiki/Help:Edit_conflict

Past Discussions

This is well-known since 2014:

https://secure.phabricator.com/T4768