Incorrect the 'slideDown' method behavior with element with height 0

[bset]

Here is an example of this issue. Steps to reproduce it:

1. Open example using link: http://jsfiddle.net/j53j1mLq/
2. Click on the 'Toggle' button (maybe several times)
3. As you can see, element with height 0 become visible for a short time and it's hidden after that
   I'm waiting for no reaction method call because of element height.

Description: on every button click the 'slideDown' and the 'slideUp' methods are called for the 'box' element in rotation.

[gibson042]

This stems from a rather curious height/width exception, ultimately dating all the way back to jQuery 1.0: http://jsfiddle.net/j53j1mLq/1/.

I doubt it's still relevant, and would be comfortable removing it. Any objections, @jquery/core?

[gnarf]

Seems safe to remove to me - So long as IE whatever doesn't throw problems if we try to set width/height to 0 (but I think we were guarding that somewhere else anyway recently) - Also, lol at that comment on that line back in 1.0 :)

[mgol]

If it works fine in IE8 without this hack, 👍 for removing.

[gibson042]

Great, so who can identify what the problematic behavior actually was? "IE flicker" isn't quite precise enough for me.

[gnarf]

only @jeresig probably

[jeresig]

Lord knows - probably for IE 5 or something. Feel free to nuke if you can't reproduce!