Upgrade to jQuery 1.4.1 / 1.4.2

[scribu]

jQuery 1.4 has just been ​released today.

We should adopt it ASAP to have time for optimizations, testing etc.

[archon810]

Seems like it has better performance, among other things. Should definitely squeeze it into 3.0.

[Denis-de-Bernardy]

For reference:

​http://jquery14.com/day-01/jquery-14#backwards

[ryan]

Widget and dashboard drag-drop, re-order, open/close looking good. Screen options okay. Autosave okay. Menu open/close okay. Not seeing anything in the console not seen also with jQuery 1.3.2.

[ryan]

(In [12792]) jQuery 1.4. fixes #11900

[Lazy79]

sorry for my comment to an closed ticket

jQuery 1.4.1 Bugfix Version released - but jQuery 1.4.2 should follow soon. maybe waiting for 1.4.2 to upgrade.

[nacin]

Might as well re-open this ticket then.

I'm thinking we should keep committing the most recent release, even if 1.4.2 is soon to follow, as it'll give us as much time as possible to kick the tires.

[azaozz]

Lets hope this won't break lots of plugins like the last update. These don't look good:

Backwards-Incompatible Changes
...
jQuery() (with no arguments) no longer converts to jQuery(document).

If an Ajax request is made without specifying a dataType and it is returned as text/javascript, it will be executed. Previously, an explicit dataType was required.

[ryan]

(In [13011]) jQuery 1.4.1. Props Simek. fixes #11900