See my WIP follow-up attempt for the Bernoulli number article here: https://gerrit.wikimedia.org/r/c/mediawiki/extensions/ReaderExperiments/+/1215782; patchdemo here: https://9e8787bfd6.catalyst.wmcloud.org/wiki/Bernoulli_number?stickyHeaders=1

In T411869#11437707, @Etonkovidova wrote:

There are quite few cases to check after the fix - did not see what may cause some article do not cooperate with the sticky headers.

• https://en.wikipedia.org/wiki/Bernoulli_number?stickyHeaders=1&useparsoid=0 (but it's ok for https://en.wikipedia.org/wiki/Euler%E2%80%93Maclaurin_formula)

• https://en.wikipedia.org/wiki/Bernoulli_polynomials?stickyHeaders=1&useparsoid=0

Sticky headers work in this article - https://en.wikipedia.org/wiki/Euler%E2%80%93Maclaurin_formula

@lwatson / @SherryYang-WMF looks like this was a content issue, not anything RG should be worrying about.

Fully QAing this task may require a full local experiment setup (which is not trivial to do), since we are using experiment inclusion as the determining factor of whether this option should be disabled or not.

As an alternative to limiting the feature or the experiment, we could just capture the page length in the events we collect, using mw.config.get( 'wgWMEPageLength', -1 ); to round to nearest log10 value (thanks @Jdlrobson for the suggestion). This might make it easier to segment the data in post.

Hey @A_smart_kitten and @Bugreporter, thanks for your interest here. I'll answer your questions as best I can below.

In T403659#11382696, @Esanders wrote:

Might it make sense to move files around according to feature/ownership, instead of grouping by RL module? e.g. an /editor folder that contains a /editor/init sub-folder containing editor-related files that are currently in /mobile.init/, and an editor/startup folder etc?

I've made a few updates to the file that @Jdlrobson created here, and I've pinged the Editing and Reader Experience teams for their respective OK. Once I have those, we can finalize this and merge it.