Definitions:
- Headless layer: a CALayer without a delegate.
- Mounted layer: a CALayer that has been flushed to the render server either via a runloop pump or via `[CATransaction flush]`.
Context:
MDCShadowLayer includes some logic for animating shadowPath changes alongside corresponding bounds animations. The intent is that, if `shadowPath` is changed then it attempts to inherit any animation traits from existing bounds-related animations, if they exist. This behavior was added in https://github.com/material-components/material-components-ios/pull/2523. This behavior enables changes to shadowPath (which are not animatable by UIView-based animations) to inherit existing UIView-based animations.
Prior to this change, only bounds.size would be inspected for this piggy-backing behavior. While this works for UIView-based animations, which decompose `.frame` and `.bounds` animations into `bounds.size` and `bounds.origin`, this does not work for headless layers which directly animate the `bounds` property. E.g. the following snippet would piggy back as expected:
```objc
[UIView animateWithDuration:0.1 animations:^{
someView.frame = CGRectMake(0, 0, 100, 50);
someView.layer.shadowPath = [UIBezierPath bezierPathWithRect:someView.bounds].CGPath;
}];
```
But the following would not:
```objc
[CATransaction begin];
[CATransaction setAnimationDuration:0.5];
shadowLayer.bounds = CGRectMake(0, 0, 100, 50);
shadowLayer.shadowPath = [UIBezierPath bezierPathWithRect:shadowLayer.bounds].CGPath;
[CATransaction commit];
```
After this change, MDCShadowLayer will check for animations to `bounds` as well, increasing the likelihood that the shadowPath is able to piggy-back existing animations.
This change is part of addressing https://github.com/material-components/material-components-ios/issues/8644
Removes the need to copy-paste stanzas from other files anymore as we'll rely on #4478 to generate the correct stanza for us instead.
This was an automated change generated by running a find-and-replace regular expression:
```
/\*
Copyright ([0-9]+)-present the Material Components for iOS authors\. All Rights Reserved\.
Licensed under the Apache License, Version 2\.0 \(the "License"\);
you may not use this file except in compliance with the License\.
You may obtain a copy of the License at
http://www\.apache\.org/licenses/LICENSE-2\.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied\.
See the License for the specific language governing permissions and
limitations under the License\.
\*/
```
```
/\*
Copyright ([0-9]+)-present the Material Components for iOS authors\. All Rights Reserved\.
Licensed under the Apache License, Version 2\.0 \(the "License"\);
you may not use this file except in compliance with the License\.
You may obtain a copy of the License at
http://www\.apache\.org/licenses/LICENSE-2\.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied\.
See the License for the specific language governing permissions and
limitations under the License\.
\*/
```
```
/\*
Copyright ([0-9]+)-present the Material Components for iOS authors\. All Rights Reserved\.
Licensed under the Apache License, Version 2\.0 \(the "License"\);
you may not use this file except in compliance with the License\.
You may obtain a copy of the License at
http://www\.apache\.org/licenses/LICENSE-2\.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied\.
See the License for the specific language governing permissions and
limitations under the License\.
\*/
```
```
// Copyright $1-present the Material Components for iOS authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
```
* [ShadowLayer] Add NSCoding support
* Cut release candidate.
* Fixed double/CGFloat conversion error and formatting in MDCFlexibleHeaderView.m.
* Undid CGFloat cast for one property.
* Removed pod install and build cleaning from the build-all script.
* Added a "test_all" script.
* Added component changes.
* Fixed scripts/release/diff.
* Added API diffs.
* Fixed bump usage of manage_pods.
* Bumped version to 17.2.0.
* Added release version to CHANGELOG.md.
* [HeaderStackView] - Added IB_Designable, NSCoding support, swift example (#983)
* [NavigationBar] - Added NSCoding support (#985)
* Podfile.lock
* Fixed double/CGFloat conversion error and formatting in MDCFlexibleHeaderView.m.
* Bumped version to 17.2.0.
* [ShadowLayer] Add NSCoding support
* Podfile.lock
* FHV from develop
* [ShadowLayer] Add encode/decode test
* Add commonInit
* Remove initWithLayer pending further investigation
* Add TODO. Cleanup.
* [ShadowLayer] Add TODO #1021
