Enabled. Although seems that the extension don't work ... But there is no time for testing and no support, and formally this is another task.

Seems, it's a bug in code. How can resolve or get around this issue?
Which code show the revision requirement for this NS?

@Reedy, could you resolve this bug or disable the revision requirement for these NS?

T226054 The problem is that FlaggedRevs is already included in MediaWiki and you need to confirm revisions on a mass of pages. But this is not possible because the confirmation button is disabled. Can to approve this message from one page, but it will appear again and again, since Mediawiki pages cannot be patrolled.
During the year there was no solution to this problem.

Also with NS MediaWiki.
I am administrator and created the MediaWiki:Encyclopedias_settings.json and MediaWiki:Wikiprojects settings.json pages, which are included in most ruWikisource pages of Main NS. Now, after edits on pages (seems, only new users' edits), appear the requirement to review these MediaWiki pages, but this imposible to do. Can to remove this message from one page, but it will appear again and again, since Mediawiki pages cannot be patrolled.

The hotfix works on broken Russian Wikisource images. https://ru.wikisource.org/wiki/%D0%A1%D1%82%D1%80%D0%B0%D0%BD%D0%B8%D1%86%D0%B0:%D0%95%D0%B2%D1%82%D0%B8%D0%B4%D0%B5%D0%BC_(%D0%9F%D0%BB%D0%B0%D1%82%D0%BE%D0%BD,_1878).pdf/57, https://ru.wikisource.org/w/index.php?title=%D0%A1%D1%82%D1%80%D0%B0%D0%BD%D0%B8%D1%86%D0%B0:%D0%A2%D0%B8%D0%BC%D0%B5%D0%B9_%D0%B8_%D0%9A%D1%80%D0%B8%D1%82%D0%B8%D0%B9_(%D0%9F%D0%BB%D0%B0%D1%82%D0%BE%D0%BD,_%D0%9C%D0%B0%D0%BB%D0%B5%D0%B2%D0%B0%D0%BD%D1%81%D0%BA%D0%B8%D0%B9).pdf/308

As far as I understand, this extension is not active and abandoned, because the author did not saw interest of community. I don't understand why my suggestion to call interest of community to it caused your questions.

@freephile, could you add your extention on https://meta.wikimedia.org/wiki/Community_Wishlist_Survey_2020/Wikisource?

I removed Wikipedia from the commit, remains only Wikisources there.

It do, I think. This problem was not until was disabled FlaggedRevs for NS "Wikisourse". And there don't using [[{{LOCALDAY}}. {{LOCALMONTHNAME}}]] [[{{LOCALYEAR}}]] {{#time}} unlike T119366.
Also, the unupdated version shows as stabilized: https://ru.wikisource.org/w/index.php?title=Заглавная_страница&stable=1. I tried to disable stabilisation for Main page, but problem still, because a transcludion can' be reviewed, as I wrote in this task.

On the Main page of https://ru.wikisource.org for unlogged readers still showing old News. It doesn't updating. (They placed in NS "Wikisource" and can't be revieved for show.) What to do?

This var_dump($wgFlaggedRevsNamespaces) have #6 (NS File), seems it now work (an example is above in post). Update: hm... I update page and it again shown links to not reviewed NS File: https://ru.wikisource.org/w/index.php?title=ИЭС/Раджа&oldid=3672630&diff=cur

I reopen the task. Unfortantelly, it is not resolved.

How large performance issues can will? Will it a noticeable? From that link it not clear. AFAIU, the webfonts downloads once then caching for alltime.

Thank you!

@Aklapper: why not, Bawolff have status "disabled".

Unfortunately, it don't work again.

I could, but unfortunately the login on Gerrit is broken. T220867

It will be great.
How long to wait for fix of login?

Ok, thank you again!

I did not quite understand. Now fonts will be downloaded automatically for all readers? Or will each reader required to register in WMF, and then manually enable font autodownloading in the ULS interface (by clicking on the gear icon near the list of interwiki)?

This is amazing, thank you!
Will this also works on Wikisource by T219065?

T219065

Glagolitic is in the font 'Menaion', it requested in T219065.

We will try via the extention. Thank you!

Is it possible to download these fonts from https://tools.wmflabs.org/ruwikisource/ with MediaWiki:Common.css?

The rules of ru.Wikisource has a permission to add texts written in Russian Church Slavonic, Old Church Slavonic, and Glagolitic script.
These are fonts for the ability to display them, otherwise they not shows. This site https://sci.ponomar.net/fonts.html is main source of fonts.
Although, seems on ru.Wikisource no texts using these fonts. They are transferred to the common Wikisource, where the text headers there have the link to this site for downloading fonts (example).

I found it there https://meta.wikimedia.org/wiki/Talk:Interwiki_map#Bibliowiki. Thanks.

Sorry for confusing, I updated the task.

Still needs a list of clear steps to reproduce the problem, including links. :( See T203897#4569643

@Vladis13: Gadgets are per-wiki settings and their code is on-wiki. If "obviously some kind of gadget" is enabled on your wiki or broken on your wiki then you need to contact admins on your wiki to fix the broken gadget code on your wiki.

Well, then it is not gadget. :) Thanks @JJMC89 for T203897#4570067, now we know that it is ext. CodeMirror on the button in new edit toolbar. This new edit panel globally replaced the previous one about 1-2 months ago.

Is way to disable it via settings?
Now very hard to work. Each press of a button is like a merry-go-round of glitches, they are different each time. Or the button for turning off the highlighting does not work. Another time when press the text size is reduced by half.
When opening a page in the Page namespace and the button was enabled past time, the scan image is shown not on the right, but below the text, which is very inconvenient.
And if the browser will drop status the button?
The editor should always check whether a button is pressed on it or not?

As term "beta-gadget" I meant that it's obvious that this is some kind of gadget in beta condition. I did not mean it in https://ru.wikisource.org/wiki/Служебная:Настройки#mw-prefsection-betafeatures.
But then it is not clear, why the beta gadget is released into the main space, without test notifications, and is not packaged as a "gadget" or "betafeatures"?

In the browser console is red error "Uncaught Error: Another textSelection API was already registered" with mention of the CodeMirror script.

This question is to whom? If to the requester (me), we are waiting of course. Thanks.

I confused. Is the issue resolved? It is necessary give the bot permission in wikisources for resolve the issue? Will it make only "touch" of Index pages?
If the bot is nominated for get rights of global bot, then not need to give the bot permission in ruwikisource? Can just close nomination for bot in ruwikisource and other?

On ru-forum proposed a temporary solution, add to personal common.css:

.prp-page-image img { width: 100% !important; height: auto !important; }

Thank you too! Your help is very useful.
Also before was a problem T176393 that one gadget conflicted with the ProoreadsPage.

Seems, the error appears while enabled the gadget mw-input-wpgadgets-Navigation_popups. Also is no the error in anonymity mode that also disabling gadgets.

Strange... For me now, with the issues opens this 2st link, and about half random others. First opens good, then after ~1 sec image reloads to 100px width.

Sure. one, two

Unfortunately, this continues. On same pages. And on new pages with images that are no in my cache, and I sure on server too, because nobody read these for months.
I did drop cache of my Chromium by ctrl+R, ctrt+F5, clicking on timer in rightup, and by drop cache in browser's History menu.
You can check this by opening the pages for editing at the URL specified above, and on the other pages by the "Next page" tab there.

Still happening in Russian Wikisource. E.g. edit of Страница:Толковый словарь Даля (2-е издание). Том 1 (1880).pdf/623

Looks like. But there the problem is also with "height", and only when creating pages.

I see. Unfortunately, a small font size there, compression or converting to djvu make text unreadable. I've done about a dozen variations of this file in different formats.
Ok, then such the missing double page with picture should be only one. I think it's easier to upload separately.
Thank you very much.

Is it possible to restore missed thumbnails without re-uploading?

As I understand, the extension is ready. Perhaps it's time to just go on to apply for a security check?