Updating the 1-8-stable version to 1.8.12pre
Datepicker: Changed a comment that causes problems with YUI Compressor. Fixes #7129 - Datepicker: Can't minify with YUI Compressor.
(cherry picked from commit 6d0164571647e169c9674a2853f3223caf188e7e)
Merge branch '1-8-stable' of github.com:jquery/jquery-ui into 1-8-stable
Tabs: Updates cookie demo to include more information on how to find cookie plugin. Fixes #7172, [Documentation] Explain cookie plugin is included in externals.(cherry picked from commit 4d557092ffe070c0c52a852530d3947436175539)
Restructured if/else's for better readability
(cherry picked from commit 3ce8429f4fce08176c8bc06d4ff4bf8830f8c916)
Slider: Properly handle value and value methods as setters. Fixes #4881 - Slider: value and values methods as setters aren't chainable.
(cherry picked from commit 2197c61f1f91a7b5046fb994d370f38ded602ee6)
Datepicker: Only generate yearshtml once. Fixes #7176 - Datepicker shows only single year in year dropdown if numberOfMonths > 1.
(cherry picked from commit 98c53d8432990f2c674e3a1274141b64a87d8ee9)
Autocomplete (combobox demo): Blur the button on click to avoid a bug.

Thanks tyron.
(cherry picked from commit 401c91418ce855b706756bdf804346d3a0d95132)
Sortable: Reverted 56b0da59d71396a740cf48a75902243d561ba186 as #4551 is invalid.
(cherry picked from commit 54016b8469345a325e8c1ab6f8a7d17b0f0f8d01)
Dialog: Don't use .attr( props, true ) for creating buttons since that API doesn't exist in jQueery 1.3.2. Fixes #7226 - Dialog buttons badly handled with JQuery 1.3.2.
Progressbar: hide valueDiv when value is 0. Fixes #7231 - valueDiv should be hidden when value is at 0%
(cherry picked from commit 3b77ac654b079a3098d12cca04d2397bb3863b85)
Progressbar: Added unit test for #7231 - valueDiv should be hidden when value is at 0%
(cherry picked from commit 7272f3bdef8ebc81cc51d3749fdeb4696eda666a)
Resizable: Added a non-visible yet non-transparent (apparently) no-request background-image on resizable handles to work around an IE bug. Fixed #7233 - Resizable: resizable handles fail to work in IE if transparent and content overlaps
(cherry picked from commit 64f13b661a571806bdfb181d1ef511ac9e2771b3)
Resizable: use background-image:url(data:) instead of background-image:url(about:blank) as it's shorter and safer. Thanks @epascarello . Better fixes #7233 - Resizable: resizable handles fail to work in IE if transparent and content overlaps
(cherry picked from commit 08b6a2b5189f62c62a0ee725629087b445f308d7)
Tagging the 1.8.12 release.
Updating the 1-8-stable version to 1.8.13pre
Datepicker: Fixed dateFormat for nl locale. Fixes #7250 - Datepicker: Incorrect dateFormat in jquery.ui.datepicker-nl.js.
(cherry picked from commit 3af0923b73317750ac7a7e431e3fa515f18e5092)
Datepicker: Fixed Slovak locale. Fixes #7254 - Datepicker: Incorrect day name for Slovak localization.
(cherry picked from commit 59c787fa4a975547e7789928126028bdfe132582)
Class Animation: Use .attr( "class" ) instead of .attr( "className" ) and adjust the queueing logic for jQuery 1.6 compatibility. Fixes #7275 - $.effects.animateClass broken in jQuery 1.6.
Resizable: switch data: background image to valid image file, small 1px transparent gif. Fixed #7293 - Resizable: Chrome dev tools console shows GET data: undefined (undefined)
(cherry picked from commit 5058ac3ce7a45c5823f4c108b0ae3ae45346d0f8)