Dialog: Get rid of z-index workaround, document it instead

[Jörn Zaefferer]

Currently the appendTo("body")-workaround for fixing z-index issues in IE6 causes more trouble then it solves, ie. ​http://forum.jquery.com/topic/dialog-will-move-its-div-tag-to-body

We should get rid of that workaround and instead document how manually apply it, via .dialog().dialog("widget").appendTo("body").

IE6 gets less important everyday, so we should move on, too. If this works for dialog, we can then do the same for other widgets that currently use the same workaround.

[sslavic]

Just got hit by this - expected dialog would be in container div, which was part of form; since dialog got moved out of form, any inputs in the dialog container div don't get submitted.

[zniki.ru]

Replying to sslavic:

Just got hit by this - expected dialog would be in container div, which was part of form; since dialog got moved out of form, any inputs in the dialog container div don't get submitted.

Have the same problem.
There is solve and bug illustration.
jQuery 1.8.21
​http://jsbin.com/awulib/2

[Nate Eagle]

Dialog: Awesome new stacking and overlay implementation. Fixes the following tickets:

Fixes #3534 - Dialog: Modal dialog disables all input elements on page. Fixes #4671 - Dialog: Modal Dialog disables vertical scroll bar in Chrome & Safari. Fixes #4995 - Dialog: Modal Dialog's overlay dissapears in IE when content is tall. Fixes #5388 - Dialog: Don't change z-index when already at the top. Fixes #5466 - Dialog: "modal" Dialog Incorrectly Cancels Input Events. Fixes #5762 - Dialog: Get rid of z-index workaround, document it instead. Fixes #6267 - Dialog: checkboxes that inherit a z-index < jqueryui.dialog z-index don't work. Fixes #7051 - Dialog: modal prevents tab key from moving focus off slider handle. Fixes #7107 - Dialog: Modal dialog event loss with high zindex child elements (FF 3.6). Fixes #7120 - Dialog: Modal operation interrupts drag drop marker functionality on gmaps. Fixes #8172 - Dialog: Change event cancelled when opening modal dialog from another modal dialog. Fixes #8583 - Dialog: Mouse event wrongly stopped. Fixes #8722 - Dialog: Remove stack option. Fixes #8729 - Dialog: Remove zIndex option.

Changeset: 3829a37ca122e923c3a08b964c4b1a946a2a1456