I can't make this happen. Did you do anything interesting to the table first?

Not sure actually, I was able to edit the table after I reloaded VE. Don't have the exact steps for now, unfortunately.

I face this issue only when I have Grammarly extension enabled :)

Looks like grammarly is inserting <g> tags into the surface to annotate grammar mistakes.

See also https://github.com/ckeditor/ckeditor5/issues/267

Change 368822 had a related patch set uploaded (by Esanders; owner: Esanders):
[VisualEditor/VisualEditor@master] Disable Grammarly

https://gerrit.wikimedia.org/r/368822

The above patch fixes one known source of rogue tags, but we should probably do something other than crash fatally when encountering them.

Change 368822 merged by jenkins-bot:
[VisualEditor/VisualEditor@master] Disable Grammarly

https://gerrit.wikimedia.org/r/368822

Change 368825 had a related patch set uploaded (by Esanders; owner: Esanders):
[VisualEditor/VisualEditor@master] Don't throw an exception if observed annotation is alien to us

https://gerrit.wikimedia.org/r/368825

Change 368825 merged by jenkins-bot:
[VisualEditor/VisualEditor@master] Don't throw an exception if observed annotation is alien to us

https://gerrit.wikimedia.org/r/368825

Change 368830 had a related patch set uploaded (by Jforrester; owner: Jforrester):
[mediawiki/extensions/VisualEditor@master] Update VE core submodule to master (4d6745b2f)

https://gerrit.wikimedia.org/r/368830

Change 368830 merged by jenkins-bot:
[mediawiki/extensions/VisualEditor@master] Update VE core submodule to master (4d6745b2f)

https://gerrit.wikimedia.org/r/368830

Was this reported to Grammarly? They were very responsive at fixing their bugs in their interaction with CX, such as T124152.

While trying to verify this, I see that for other pages with tables, Grammarly stays disabled when editing table cells and therefore everything works fine. But today while testing on production, I noticed it getting enabled when I edit the fourth column of that specific table mentioned in the bug report on this page: https://www.mediawiki.org/wiki/Wikimedia_Hackathon_2017/Mentoring_Program?veaction=edit&section=10

The following issue occurs when I edit that table:

Steps:

1. Insert a new row
2. Add text to the first, second and third column of that row and observe that Grammarly does not get enabled
3. However, as soon as you add something in the fourth column Grammarly gets enabled
4. Add something to the fifth cell.
5. Go back to the fourth cell and add a line break

Observe that, The content in the fifth cell moves to the sixth cell.

I have tried to re-create the scenario on this page: https://www.mediawiki.org/wiki/User:RYasmeen_(WMF)/Sandbox

And looks like Grammarly gets enabled again for the entire column of a table, if there is one cell in that column that has a multiline paragraph.

@Amire80 it looks like they just blacklisted CX upstream, we have effectively done that with the data attribute. I think our solution is better as it allows us to turn in back on should we come up with a solution.

Heh. It's a shame... I wouldn't object to people using tools to improve their grammar, as long as it doesn't break our articles. Oh well :)

I have shot a mail to Grammarly. Let's see.

I re-enabled Grammarly in the Visual Editor and it seems to work just fine, also when editing a table

EDIT: no, it doesn't work.