Couldn't replicate this on enwiki under any skin with Firefox or Chrome

I noticed this on Wikitech earlier today when my watchlist updated (live updates on). Refreshing the page fixed the issue. I haven't encountered it anywhere else yet.

I think this is because the highlight container divs (added by T198139: Move construction of highlight containers to server) have no CSS rules hiding them in the old UI (non-RCFilters mode). In Chrome, the div containing these divs doesn't break the line even though it's display: block, and I don't understand why. I could easily understand Edge behaving differently (and all the reports on VPT are in Edge).

Also note they're set to display: inline-block by the RCFilters CSS, but that doesn't load with RCFilters disabled of course.

Change 443019 had a related patch set uploaded (by Catrope; owner: Catrope):
[mediawiki/core@master] RCFilters: Hide highlight containers when RCFilters is disabled

https://gerrit.wikimedia.org/r/443019

In T198440#4323808, @gerritbot wrote:

Change 443019 had a related patch set uploaded (by Catrope; owner: Catrope):
[mediawiki/core@master] RCFilters: Hide highlight containers when RCFilters is disabled

https://gerrit.wikimedia.org/r/443019

This patch is speculative because I couldn't test it in Edge myself, but I did test that it's harmless in Firefox and Chrome.

In T198440#4323802, @Catrope wrote:

I think this is because the highlight container divs (added by T198139: Move construction of highlight containers to server) have no CSS rules hiding them in the old UI (non-RCFilters mode). In Chrome, the div containing these divs doesn't break the line even though it's display: block, and I don't understand why. I could easily understand Edge behaving differently (and all the reports on VPT are in Edge).

In T198440#4323748, @JJMC89 wrote:

I noticed this on Wikitech earlier today when my watchlist updated (live updates on). Refreshing the page fixed the issue. I haven't encountered it anywhere else yet.

I was using Chrome (67.0.3396.87) with improved RecentChanges enabled.

Please, folks, always include a screenshot. I couldn't reproduce this at first because I had enhanced RC enabled ("Group changes by page in recent changes and watchlist") and apparently the issues does not affect that mode. It would be obvious that I have to disable that if there was a screenshot.

So, here's a screenshot, for future reference:

Change 443019 merged by jenkins-bot:
[mediawiki/core@master] RCFilters: Hide highlight containers when RCFilters is disabled

https://gerrit.wikimedia.org/r/443019

Checked in betalabs Edge17/Windows10 (checked IE11 too) - the fix seems to be fine:

Change 443461 had a related patch set uploaded (by Bartosz Dziewoński; owner: Catrope):
[mediawiki/core@wmf/1.32.0-wmf.10] RCFilters: Hide highlight containers when RCFilters is disabled

https://gerrit.wikimedia.org/r/443461

Change 443461 merged by jenkins-bot:
[mediawiki/core@wmf/1.32.0-wmf.10] RCFilters: Hide highlight containers when RCFilters is disabled

https://gerrit.wikimedia.org/r/443461

Mentioned in SAL (#wikimedia-operations) [2018-07-02T18:47:34Z] <niharika29@deploy1001> Synchronized php-1.32.0-wmf.10/resources/src/: RCFilters: Hide highlight containers when RCFilters is disabled T198440 (duration: 00m 51s)

The fix is now deployed to Wikimedia wikis.