Prior to this fix, ngAnimate would always trigger animations even if
the browser tab or browser window is not in view. This issue was
important to fix because browsers do not flush calls to
requestAnimationFrame when they are not active.

This fix ensures that ngAnimate will respect `document.hidden` in
order to get around this.

Closes angular#12842

Prior to this fix, ngAnimate would always trigger animations even if
the browser tab or browser window was not visible. This would cause
issues with class updates / DOM operations even if elements were not
using animations. The root cause is that browsers do not flush calls to
requestAnimationFrame when browser windows / tabs are not visible.

This fix disables animations if `document.hidden` is `true`.

Closes #12842
Closes #13776

<a name="1.4.9"></a>
# 1.4.9 implicit-superannuation (2016-01-21)

## Bug Fixes

- **Animation**
  - ensure that animate promises resolve when the document is hidden
  ([9a60408c](angular/angular.js@9a60408))
  - do not trigger animations if the document is hidden
  ([09f6061a](angular/angular.js@09f6061),
   [elastic#12842](angular/angular.js#12842), [elastic#13776](angular/angular.js#13776))
  - only copy over the animation options once
  ([2fc954d3](angular/angular.js@2fc954d),
   [elastic#13722](angular/angular.js#13722), [elastic#13578](angular/angular.js#13578))
  - allow event listeners on document in IE
  ([5ba4419e](angular/angular.js@5ba4419),
   [elastic#13548](angular/angular.js#13548), [elastic#13696](angular/angular.js#13696))
  - allow removing classes that are added by a running animation
  ([6c4581fc](angular/angular.js@6c4581f),
   [elastic#13339](angular/angular.js#13339), [elastic#13380](angular/angular.js#13380), [elastic#13414](angular/angular.js#13414), [elastic#13472](angular/angular.js#13472), [elastic#13678](angular/angular.js#13678))
  - do not use `event.timeStamp` anymore for time tracking
  ([620a20d1](angular/angular.js@620a20d),
   [elastic#13494](angular/angular.js#13494), [elastic#13495](angular/angular.js#13495))
  - ignore children without animation data when closing them
  ([be01cebf](angular/angular.js@be01ceb),
   [elastic#11992](angular/angular.js#11992), [elastic#13424](angular/angular.js#13424))
  - do not alter the provided options data
  ([7a81e6fe](angular/angular.js@7a81e6f),
   [elastic#13040](angular/angular.js#13040), [elastic#13175](angular/angular.js#13175))
  - correctly handle `$animate.pin()` host elements
  ([a985adfd](angular/angular.js@a985adf),
   [elastic#13783](angular/angular.js#13783))
  - allow animations when pinned element is parent element
  ([4cb8ac61](angular/angular.js@4cb8ac6),
   [elastic#13466](angular/angular.js#13466))
  - allow enabled children to animate on disabled parents
  ([6d85f24e](angular/angular.js@6d85f24),
   [elastic#13179](angular/angular.js#13179), [elastic#13695](angular/angular.js#13695))
  - correctly access `minErr`
  ([0c1b54f0](angular/angular.js@0c1b54f))
  - ensure animate runner is the same with and without animations
  ([937942f5](angular/angular.js@937942f),
   [elastic#13205](angular/angular.js#13205), [elastic#13347](angular/angular.js#13347))
  - remove animation end event listeners on close
  ([d9157849](angular/angular.js@d915784),
   [elastic#13672](angular/angular.js#13672))
  - consider options.delay value for closing timeout
  ([592bf516](angular/angular.js@592bf51),
   [elastic#13355](angular/angular.js#13355), [elastic#13363](angular/angular.js#13363))
- **$controller:** allow identifiers containing `$`
  ([2563ff7b](angular/angular.js@2563ff7),
   [elastic#13736](angular/angular.js#13736))
- **$http:** throw if url passed is not a string
  ([c5bf9dae](angular/angular.js@c5bf9da),
   [elastic#12925](angular/angular.js#12925), [elastic#13444](angular/angular.js#13444))
- **$parse:** handle interceptors with `undefined` expressions
  ([7bb2414b](angular/angular.js@7bb2414))
- **$resource:** don't allow using promises as `timeout` and log a warning
  ([47486524](angular/angular.js@4748652))
- **formatNumber:** cope with large and small number corner cases
  ([9c49eb13](angular/angular.js@9c49eb1),
   [elastic#13394](angular/angular.js#13394), [elastic#8674](angular/angular.js#8674), [elastic#12709](angular/angular.js#12709), [elastic#8705](angular/angular.js#8705), [elastic#12707](angular/angular.js#12707), [elastic#10246](angular/angular.js#10246), [elastic#10252](angular/angular.js#10252))
- **input:**
  - fix URL validation being too strict
  ([6610ae81](angular/angular.js@6610ae8),
   [elastic#13528](angular/angular.js#13528), [elastic#13544](angular/angular.js#13544))
  - add missing chars to URL validation regex
  ([2995b54a](angular/angular.js@2995b54),
   [elastic#13379](angular/angular.js#13379), [elastic#13460](angular/angular.js#13460))
- **isArrayLike:** recognize empty instances of an Array subclass
  ([323f9ab7](angular/angular.js@323f9ab),
   [elastic#13560](angular/angular.js#13560), [elastic#13708](angular/angular.js#13708))
- **ngInclude:** do not compile template if original scope is destroyed
  ([9590bcf0](angular/angular.js@9590bcf))
- **ngOptions:**
  - don't skip `optgroup` elements with `value === ''`
  ([85e392f3](angular/angular.js@85e392f),
   [elastic#13487](angular/angular.js#13487), [elastic#13489](angular/angular.js#13489))
  - don't `$dirty` multiple select after compilation
  ([f163c905](angular/angular.js@f163c90),
   [elastic#13211](angular/angular.js#13211), [elastic#13326](angular/angular.js#13326))
- **select:** re-define `ngModelCtrl.$render` in the `select` directive's postLink function
  ([529b2507](angular/angular.js@529b250),
   [elastic#13583](angular/angular.js#13583), [elastic#13583](angular/angular.js#13583), [elastic#13663](angular/angular.js#13663))

## Minor Features

- **ngLocale:** add support for standalone months
  ([54c4041e](angular/angular.js@54c4041),
   [elastic#3744](angular/angular.js#3744), [elastic#10247](angular/angular.js#10247), [elastic#12642](angular/angular.js#12642), [elastic#12844](angular/angular.js#12844))
- **ngMock:** add support for `$animate.closeAndFlush()`
  ([512c0811](angular/angular.js@512c081))

## Performance Improvements

- **ngAnimate:** speed up `areAnimationsAllowed` check
  ([2d3303dd](angular/angular.js@2d3303d))

## Breaking Changes

While we do not deem the following to be a real breaking change we are highlighting it here in the
changelog to ensure that it does not surprise anyone.

- **$resource:** due to [47486524](angular/angular.js@4748652),

**Possible breaking change** for users who updated their code to provide a `timeout`
promise for a `$resource` request in version v1.4.8.

Up to v1.4.7 (included), using a promise as a timeout in `$resource`, would silently
fail (i.e. have no effect).

In v1.4.8, using a promise as timeout would have the (buggy) behaviour described
in angular/angular.js#12657 (comment).
(I.e. it will work as expected for the first time you resolve the promise and will
cancel all subsequent requests after that - one has to re-create the resource
class. This was not documented.)

With this change, using a promise as timeout in v1.4.9 onwards is not allowed.
It will log a warning and ignore the timeout value.

If you need support for cancellable `$resource` actions, you should upgrade to
version 1.5 or higher.

<a name="1.4.8"></a>
# 1.4.8 ice-manipulation (2015-11-19)

## Bug Fixes

- **$animate:** ensure leave animation calls `close` callback
  ([6bd6dbff](angular/angular.js@6bd6dbf),
   [elastic#12278](angular/angular.js#12278), [elastic#12096](angular/angular.js#12096), [elastic#13054](angular/angular.js#13054))
- **$cacheFactory:** check key exists before decreasing cache size count
  ([2a5a52a7](angular/angular.js@2a5a52a),
   [elastic#12321](angular/angular.js#12321), [elastic#12329](angular/angular.js#12329))
- **$compile:**
  - bind all directive controllers correctly when using `bindToController`
  ([5d8861fb](angular/angular.js@5d8861f),
   [elastic#11343](angular/angular.js#11343), [elastic#11345](angular/angular.js#11345))
  - evaluate against the correct scope with bindToController on new scope
  ([b9f7c453](angular/angular.js@b9f7c45),
   [elastic#13021](angular/angular.js#13021), [elastic#13025](angular/angular.js#13025))
  - fix scoping of transclusion directives inside replace directive
  ([74da0340](angular/angular.js@74da034),
   [elastic#12975](angular/angular.js#12975), [elastic#12936](angular/angular.js#12936), [elastic#13244](angular/angular.js#13244))
- **$http:** apply `transformResponse` even when `data` is empty
  ([c6909464](angular/angular.js@c690946),
   [elastic#12976](angular/angular.js#12976), [elastic#12979](angular/angular.js#12979))
- **$location:** ensure `$locationChangeSuccess` fires even if URL ends with `#`
  ([6f8ddb6d](angular/angular.js@6f8ddb6),
   [elastic#12175](angular/angular.js#12175), [elastic#13251](angular/angular.js#13251))
- **$parse:** evaluate once simple expressions only once
  ([e4036824](angular/angular.js@e403682),
   [elastic#12983](angular/angular.js#12983), [elastic#13002](angular/angular.js#13002))
- **$resource:** allow XHR request to be cancelled via a timeout promise
  ([7170f9d9](angular/angular.js@7170f9d),
   [elastic#12657](angular/angular.js#12657), [elastic#12675](angular/angular.js#12675), [elastic#10890](angular/angular.js#10890), [elastic#9332](angular/angular.js#9332))
- **$rootScope:** prevent IE9 memory leak when destroying scopes
  ([87b0055c](angular/angular.js@87b0055),
   [elastic#10706](angular/angular.js#10706), [elastic#11786](angular/angular.js#11786))
- **Angular.js:** fix `isArrayLike` for unusual cases
  ([70edec94](angular/angular.js@70edec9),
   [elastic#10186](angular/angular.js#10186), [elastic#8000](angular/angular.js#8000), [elastic#4855](angular/angular.js#4855), [elastic#4751](angular/angular.js#4751), [elastic#10272](angular/angular.js#10272))
- **isArrayLike:** handle jQuery objects of length 0
  ([d3da55c4](angular/angular.js@d3da55c))
- **jqLite:**
  - deregister special `mouseenter` / `mouseleave` events correctly
  ([22f66025](angular/angular.js@22f6602),
   [elastic#12795](angular/angular.js#12795), [elastic#12799](angular/angular.js#12799))
  - ensure mouseenter works with svg elements on IE
  ([c1f34e8e](angular/angular.js@c1f34e8),
   [elastic#10259](angular/angular.js#10259), [elastic#10276](angular/angular.js#10276))
- **limitTo:** start at 0 if `begin` is negative and exceeds input length
  ([4fc40bc9](angular/angular.js@4fc40bc),
   [elastic#12775](angular/angular.js#12775), [elastic#12781](angular/angular.js#12781))
- **merge:**
  - ensure that jqlite->jqlite and DOM->DOM
  ([2f8db1bf](angular/angular.js@2f8db1b))
  - clone elements instead of treating them like simple objects
  ([838cf4be](angular/angular.js@838cf4b),
   [elastic#12286](angular/angular.js#12286))
- **ngAria:** don't add tabindex to radio and checkbox inputs
  ([59f1f4e1](angular/angular.js@59f1f4e),
   [elastic#12492](angular/angular.js#12492), [elastic#13095](angular/angular.js#13095))
- **ngInput:** change URL_REGEXP to better match RFC3987
  ([cb51116d](angular/angular.js@cb51116),
   [elastic#11341](angular/angular.js#11341), [elastic#11381](angular/angular.js#11381))
- **ngMock:** reset cache before every test
  ([91b7cd9b](angular/angular.js@91b7cd9),
   [elastic#13013](angular/angular.js#13013))
- **ngOptions:**
  - skip comments and empty options when looking for options
  ([0f58334b](angular/angular.js@0f58334),
   [elastic#12190](angular/angular.js#12190), [elastic#13029](angular/angular.js#13029), [elastic#13033](angular/angular.js#13033))
  - override select option registration to allow compilation of empty option
  ([7b2ecf4](angular/angular.js@7b2ecf4),
   [elastic#11685](angular/angular.js#11685), [elastic#12972](angular/angular.js#12972), [elastic#12968](angular/angular.js#12968), [elastic#13012](angular/angular.js#13012))

## Performance Improvements

- **$compile:** use static jquery data method to avoid creating new instances
  ([55ad192e](angular/angular.js@55ad192))
- **copy:**
  - avoid regex in `isTypedArray`
  ([19fab4a1](angular/angular.js@19fab4a))
  - only validate/clear if the user specifies a destination
  ([d1293540](angular/angular.js@d129354),
   [elastic#12068](angular/angular.js#12068))
- **merge:** remove unnecessary wrapping of jqLite element
  ([ce6a96b0](angular/angular.js@ce6a96b),
   [elastic#13236](angular/angular.js#13236))

## Breaking Changes

Signed-off-by: Kevin Kirsche <Kev.Kirsche@gmail.com>