As a result of T157418
```
16:23 <+arlolra> how long until we start hearing complaints about https://fr.wikipedia.org/w/index.php?title=Tom_Palmer_(rugby_%C3%A0_XV)&curid=1169884&diff=148797916&oldid=148797790&diffmode=source
16:23 <+arlolra> https://fr.wikipedia.org/w/index.php?title=Paul_Destombes&curid=11726121&diff=148798038&oldid=148798015&diffmode=source
[...]
16:32 <+subbu|away> arlolra, but, I clicked on that one link .. and from what i can make out .. heading space is gone? that is odd .. selser should have prevented that.
16:33 <+subbu|away> worth tracking .... and reverting if it looks like a problem.
16:33 <+subbu|away> later.
[...]
16:38 <+arlolra> yup ... i will monitor
16:39 <+arlolra> https://fr.wikipedia.org/w/index.php?title=Fr%C3%A9d%C3%A9ric_Michalak&curid=239627&diff=148798760&oldid=148798254&diffmode=source
16:39 <+arlolra> https://fr.wikipedia.org/w/index.php?title=Utilisateur:Daniel_AC_Mathieu/Brouillon24&curid=11536443&diff=148798728&oldid=148798186&diffmode=source
16:39 <+arlolra> yeah, we're going to need to revert
16:41 <+arlolra> https://en.wikipedia.org/w/index.php?title=Jack_Posobiec&curid=54287201&diff=842658685&oldid=842656084&diffmode=source
16:41 <+subbu|away> Looks like headings only? arlolra maybe test in a sandbox to narrow donw the problem before reverting.
16:43 <+arlolra> why is it that new heading are added with the spacing
16:43 <+arlolra> https://en.wikipedia.org/w/index.php?title=Blinn_College&curid=1246005&diff=842658946&oldid=842657772&diffmode=source
16:44 <+arlolra> it doesn't seem like we should be adding that if we're not going to preserve it
16:46 <+arlolra> https://fr.wikipedia.org/w/index.php?title=Abraham_Van_Helsing&curid=1612328&diff=148799230&oldid=148555643&diffmode=source
16:46 <+arlolra> https://fr.wikipedia.org/w/index.php?title=Rita_Moreno&curid=968101&diff=148799144&oldid=148798292&diffmode=source
16:47 <+arlolra> https://fr.wikipedia.org/w/index.php?title=Histoire_de_Saint-Malo&curid=2233500&diff=148799086&oldid=148798323&diffmode=source
16:47 <+subbu|away> anyway, collect data for fixing and revert. i wonder if it is with fallback ids.
16:48 <+arlolra> https://en.wikipedia.org/w/index.php?title=User:LawrenceScafuri/My_Work&curid=57495649&diff=842659509&oldid=842657849&diffmode=source
16:49 <+arlolra> the problem seems much more prevalent on frwiki
16:49 <+arlolra> https://fr.wikipedia.org/w/index.php?title=Navires_de_Nemi&curid=3762401&diff=148799395&oldid=148799247&diffmode=source
16:49 <+arlolra> https://fr.wikipedia.org/w/index.php?title=LZ_129_Hindenburg&curid=125296&diff=148799310&oldid=148799261&diffmode=source
16:50 <+arlolra> yeah, this seems pretty unacceptable
16:50 <+subbu|away> yes because of fallback ids for headings.
16:50 <+arlolra> i'll revert and file a bug
```