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Wikitext diff and saving not the same as what has been edited (content loss)
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Description

While editing Président (homonymie) on fr wiki, the Visual diff was strange, it showed content removal.
I thought it was a bug, but the actual result was what the Visual diff showed.
Here's a screenshot with the difference between what is being shown while editing (top of the screen) and the Visual diff:

I can't unfortunately reproduce this bug, but I thought I'd report it in case it would provide insight.

Event Timeline

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptFeb 28 2017, 2:22 PM

Do you mean that the surface showed the content when you were editing, but wikitext diff showed it was gone (and the save agreed)?

Did you touch that line? There's no edit conflict (previous edit was in August), but did you switch between editors somehow?

Jdforrester-WMF renamed this task from Visual diff and saving not the same as what has been edited (content loss) to Wikitext diff and saving not the same as what has been edited (content loss).Mar 20 2017, 7:33 PM
Jdforrester-WMF changed the task status from Open to Stalled.

Yes, exactly, and what I called "Visual diff" is the wikitext diff shown by the VisualEditor.

Yes, I made it look like what we see above the diff. No, I didn't switch between editors.

I used copy/paste for the text that disappeared (like "président du conseil d'administration"), so it may have been caused by T154123.

The_RedBurn changed the task status from Stalled to Open.Aug 31 2017, 11:18 AM

Reproduced yesterday:

https://fr.wikipedia.org/w/index.php?title=Trait%C3%A9_de_Lisbonne&diff=prev&oldid=140190630

Tried T173077#3526570 but it didn't work, and I didn't click twice on either hyperlink nor cite button. So it doesn't seem to be linked to T173077.

This time too, I used copy/paste for the text (and ref) that was lost.

Deskana added a subscriber: Deskana.

Data loss bugs are bad, but we don't know how to reproduce this. :-(

Deskana triaged this task as Normal priority.Oct 11 2017, 12:35 PM
Deskana changed the task status from Open to Stalled.