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Add a new MediaWiki system message as a content header inside #mw-content-text
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There should be a MediaWiki system message (named, for example, content-header) that appeared inside #mw-content-text, just at the beginning, before the rest of the content.

This "message" would be empty by default and, as usual, its contents would be determined by a certain page in the MediaWiki namespace.

For the equivalent footer in #mw-content-text, see T138652.

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Hello, I am Jake and here to help. What do you need help on?

Hi, @JakeTheDeveloper! Perhaps you could help on T138652, which is the equivalent task, but more urgent. Many thanks in advance! :D

This is a job for a Developer. Sorry I could not help. Here, I contacted a developer for you.

[offtopic] @JakeTheDeveloper: For your info, the Developer-notice tag is not meant for "contacting a developer" - see its project description. Basically every task needs a developer so there is no specific tag.

Hello! Gerrit is acting funny on large pages so I wrote a theoretical piece of code that should hopefully work but I have no way to test it.
/includes/Page/Article.php line 1136, function showNamespaceHeader(), add the following after the previous if statement:

if ( !$this->getTitle()->isTalkPage() && !$this->getTitle()->isSpecialPage() && !wfMessage( 'content-header' )->isDisabled() ) {
		"<div class=\"mw-content-header\">\n$1\n</div>",
		[ 'content-header' ]

Also add a line to languages/i18n/en.json:

"content-header": "-",

and to languages/i18n/qqq.json:

"content-header": "{{notranslate}}",

Thanks for taking a look at the code. If you don't want to set up Git/Gerrit, you can also use the Gerrit Patch Uploader.

A friend tested this change for me (thanks @Aca ), everything seems fine so Imma go ahead and try to upload the patch. Fingers crossed!

Change 714448 had a related patch set uploaded (by Gerrit Patch Uploader; author: Ivi104):

[mediawiki/core@master] New MW message for content namespaces: MediaWiki:Content-header

@Aklapper I uploaded the main change, but am unable to upload languages/i18n/en.json nor languages/i18n/qqq.json due to 502 Bad Gateway. Could you or someone else add the new message and upload them for me? The changes are listed in a previous comment.

Same problem on the Gerrit's web interface. Sorry, unable to help.

(If there is some problem with Gerrit, could you please bring it up on with more info? Thanks.)

502 error with Gerrit is probably better to be filed on Phabricator, not on the talk page...

Change 715147 had a related patch set uploaded (by Gerrit Patch Uploader; author: Ivi104):

[mediawiki/core@master] New MW message for content namespaces: MediaWiki:Content-header

This is the correct patch, containing everything. I tested it on my local installation, everything works. I am unable to abandon the previous patch (714448), presumably because it was uploaded via Gerrit Patch Uploader.

Change 714448 abandoned by Aklapper:

[mediawiki/core@master] New MW message for content namespaces: MediaWiki:Content-header


Superseded by

Regarding the relationship with T6469 – that adds a namespace-specific sitenotice, which would be cached once per namespace view so is very performant. But the caching implies that we cannot use {{PAGENAME}} or other magic words whose value differ between pages in the namespace.

This task is for adding a header in the content area which would be cached along with the page content – hence enabling the use of {{PAGENAME}} and the like. This is still desirable functionality in addition to that one, though I wonder if this has any performance implications.

What would this message be used for?