Migrate to jQuery 3.x

[yellowled]

Note: This should be tested before merging! See referenced issue for a list of core themes and additional plugins depending on jQuery.

• Update bundled jQuery to 3.4.1
• Add jQuery migrate plugin
• Include jQuery migrate in all frontend and backend templates

References #686

[onli]

@yellowled How can I test this for you? I assume this is still something that should be merged?

[yellowled]

@onli Basically, see #686 and the comments there. I did some testing, as did @mmitch and @surrim, but there are (additional) plugins that will break, most notably serendipity_event_commentedit.

I think the only way to be sure would be to test every plugin and/or functionality that requires jQuery to see if it requires an old version and/or if using the migrate plugin helps. In some cases (like commentedit) this seemed to require some familiarity with the – PHP – code or at least the plugin that I did not have. That's why I gave up testing.

Also, the version should be bumped to jQuery 3.6.0.

I'm not sure "how much" functonality just merging would break at this point. Probably not too too much in core, core plugins and core themes, but that's just a guess at this point.

[onli]

I gonna have a look at commentedit. It was probably too complicated for me at the time when I wrote it, but it's a feature I still want. Maybe I can clean it up and fix the bug at the same time.

Most of the other plugin errors linked in that thread seem to be PHP issues.