@Deskana It has happened again. I try to reproduce and record the bug.

@Deskana I could record the bug (edit, see the video). Three times out of my last three edits the bug was appeared when I edited "Wikipédia:Botgazdák üzenőfala" (Wikipedia:Bot requests).

Does the issue also occur when you disable https://hu.wikipedia.org/wiki/MediaWiki:Gadget-defaultsummaries.js (which adds the dropdowns below the summary input)?

@Schnark Yes, it doesn't help.

I edited that same page and managed to reproduce the problem. My edit saved, but it didn't seem to. There was an error in the JavaScript console which I captured below. (Ignore the pink background)

It's still happening, but the most annoying thing is that I don't meet with this bug on other pumps

@Deskana's error looks like it comes from https://hu.wikipedia.org/wiki/MediaWiki:Gadget-wikimenu.js.

@Tacsipacsi This edit doesn't look right: https://hu.wikipedia.org/w/index.php?title=MediaWiki:Gadget-wikimenu.js&diff=18825898&oldid=18016601

This is wrong:

var $ret = getMenuItems( $( '#wikiMenu-' + $cdiv.attr( 'title' ) ).replace(/<>/g, ''), level + 1 );

It should probably be:

var $ret = getMenuItems( $( '#wikiMenu-' + $cdiv.attr( 'title' ).replace(/<>/g, '') ), level + 1 );

(As a side note, VE probably shouldn't fail in this manner when faced with faulty 'wikipage.content' hook handlers. We should run them in a setTimeout() or try…catch something.)

@matmarex Thanks your answer! If Tacsipacsi has some time (because I cannot edit the page) and can fix it, I'll test it again.

Wikimenu fixed (I hope). However, I’d keep this task open as VE should disappear regardless of the wikipage.content handlers’ errors (I think the dialog should disappear before calling them).

On second thought… no uses of 'wikipage.content' anywhere seem to try to avoid this problem. I'm not sure if that's maybe intentional somehow?

@matmarex Today I've tested it and it looks like the problem has been solved. Thank you (and also @Tacsipacsi too)!