Summary:
Fixes LayoutAnimation when animating the position of a view that has a transform, the animation would start at the wrong position, offset by the transform translation value. I noticed this bug while working on sticky headers using animated in the UIExplorer <ListView> - Paging example.
**Test plan**
Made a simple repro for the bug https://gist.github.com/janicduplessis/eb985dc3accfd5982c77761be692e395 and tested that it fixed it. Also tested that the UIExplorer <ListView> - Paging example with sticky headers worked properly with this fix.
Closes https://github.com/facebook/react-native/pull/12140
Differential Revision: D4494389
Pulled By: mkonicek
fbshipit-source-id: dd49cb2db9dd4950e293596fbc773f7d79e8b10a
Summary:
The type key for a layout animation config must be supplied otherwise the app crashes (on Android). I added a isRequired check in JS as well as an explicit exception in java otherwise it crashed at a very hard to debug place. The crash happens when passing null to `Animation.setInterpolator` so this makes sure it never happens.
**Test plan (required)**
Tested that the error is caught properly in JS when passing an invalid animation config like
```
LayoutAnimation.configureNext({
duration: 250,
update: { type: undefined }, // or LayoutAnimation.Types.easeInEastOut in my case haha :)
});
```
Also tested the java exception.
Closes https://github.com/facebook/react-native/pull/7958
Differential Revision: D3401760
Pulled By: nicklockwood
fbshipit-source-id: 83c019d863c2b2294405b60e87297c562add0f49
