Slide animation dont work correctly in 1.8.0

[lapynow.d@…]

Heya, case below contains a small code that implement contents sliding animation, pressing menu items with classes 'mmenu_bth'. In jQuery 1.8.0. i have freezes andsometimes hangs in browser, when i do 4-5 clicks on different menu items consequentially.

Test case: ​http://jsfiddle.net/KKmTD/5/

Important notes:

1. Opening console(native or Firebug) fix this behavior (no freezes, no hangs).
2. Code work well with older jQuery versions.
3. Works fine with other browsers: Chrome, Safari, IE 9.
4. Regress to 1.7.2. version cause an other error in positioning calculation - in Chrome position caclucales incorrectly.

[lapynow.d]

Important note: in jsFiddle code works fine with any jQuery ver. But problem occur when I test code directly in Firefox 15-16.

[lapynow.d@…]

This question is investigated in bugzilla and more information you can get here: ​https://bugzilla.mozilla.org/show_bug.cgi?id=787782

[mikesherov]

gnarf, gibson042... check out that infinite loop...

[dmethvin]

Yeah, it does seem like those need to be fuzzy equals.

[gibson042]

​https://github.com/jquery/jquery/pull/922

[dmethvin]

#12495 is a duplicate of this ticket.

[dmethvin]

#12507 is a duplicate of this ticket.

[petersphilo]

Hello,

in all of the v1.7.x versions of jQuery core that i used, the .animate() method starts the animation from its current position (like margin), particularly if multiple animations are applied to the same object.
Now, in v1.8.0 and v1.8.1, the .animate() method starts from the same place, regardless of the current position of the object.
Here are 2 examples; in this website, i use .animate() to slide each 'page' horizontally by changing the 'left-margin' property
here is v1.7.1 at work (click on the page titles to navigate):
​http://ab-expert.fr
and now v1.8.1 (click on the page titles to navigate):
​http://ab-expert.fr/index-prob.html

Note!: The fiddle below shows that even v1.7.2 differs from v1.7.1 or even before (like v1.6.x) since it does not animate the second movement:
​http://jsfiddle.net/petersphilo/mGkdr/1/

I Hope this helps!

[gibson042]

Fix #12447: Ensure starting-point calc takes finite time. Close gh-922.

Changeset: ​e755c194161e1dc6793cbb690ba8334dad560c8f