Thank you, this enabled us to use the area plots for population graphs.

I guess to fix this in mediawiki/services/chart-renderer/src/lib/charts/lineChart.ts, one just needs to check the condition isValidNumberColumn( xAxisColumn ) in the function createAreaChart and use createBaseValueChartOption instead of createBaseCategoricalChartOption in that case, similarly to how it's already done in createLineChart. Perhaps with a bit of extra work, but not much.

No, this is an actual bug. The line chart is already an X/Y plot. There is no need to implement this as a new feature. In ECharts, the area chart is just the line chart with slightly different design, and in ECharts an area chart works just fine as an X/Y plot. It must be MediaWiki's input data processing not working correctly for area charts.

Related: T403020: Support date/time data type

T385344: Support specifying axis ranges (min/max) in the chart definition

We really need this because it often makes sense to start the y-axis from zero. Currently there is no way to enforce this for line or area chart, afaict.

Кажется, проблема исчезла.

Same issue here: https://commons.wikimedia.org/wiki/File:SporadicGroups.svg

Is this now an obsolete duplicate of T346291?

I recognize that it might not be obvious from the outside that the current consensus for this task is more like "everyone who even cares would be surprised that this is not yet done". So, here is the discussion, showing overwhelming, unilateral support: https://ru.wikipedia.org/wiki/Википедия:Форум/Правила#Права_флага_арбитра

If we discuss usage, here are my two pennies. In ruwiki, interactive Lua-based graphs are used in more than 26000 articles about settlements and administrative units through https://ru.wikipedia.org/wiki/Module:Statistical (also, more than 8000 on ukwiki, etc.). The Vega template is already rewritten for Vega 5 and can be extracted easily, but the data is processed dynamically, and it is quite hard to change that (although hopefully possible, in principle). Interactivity is highly desirable.

О. В рамках этого проекта будет решена давняя проблема, что сообщение о статусе статьи (ДС/ХС/ИС) отображается в мобильной версии как "Проблемы с подразделом"?

Apparently this is now resolved.

A few occurrences of <ce> are currently present at various wikis. The existence of this task probably implied turning off <ce> at some point, possibly within T153606, but it didn't happen (yet?).

Nope, same as without "unhide=1".

I cannot see blocks on Special:Contributions. I am viewing Special:Log/block. The "show" link goes to Special:RevisionDelete: https://ru.wikipedia.org/w/index.php?title=Special:RevisionDelete&target=Special%3ALog%2Fblock&type=logging&ids=33182256 (the actual link has localized names for the namespaces and the RevisionDelete page) So yes, it seems that it is the same as "change visibility" but with different supposed outcome.
If I manually replace RevisionDelete by Undelete in the URL (by the analogy with the URLs for viewing the deleted revisions, see below), I get an even more cryptic error message: "Permission error. You do not have permission to view a page's deleted history, for the following reason: The action you have requested is limited to users in one of the groups: Administrators, Arbitration committee members." (Note that actually I am an Arbitration committee member.)