Summary:
Per discussion in https://github.com/react-native-community/releases/issues/186 the iOS `PlatformColor()` function is documented to use the semantic color names provided by the system. The referenced HIG documentation itself links to the `UIColor` documentation for semantic colors names. However, these names differ depending on if you are viewing the new Swift API docs or the Objective C docs. The current Objective C implementation in react-native assumes Objective C UIColor selector names that are suffixed 'Color'. But in Swift, Apple provides a Swift Extension on UIColor that makes aliases without the the 'Color' suffix and then makes the original selectors invalid presumably via `NS_UNAVAILABLE_SWIFT`.
Since both selector names are valid depending on if you are using Objective C or Swift, let's make both forms be legal for `PlatformColor()`. In `RCTConvert.m` there is a dictionary of legal selector names. The code already supports the ability to have names be aliases of other selectors via a RCTSelector metadata key. The change adds code to the initialization of the map: it iterates over the keys in the map, which are all ObjC style UIColor selectors, and creates aliases by duplicating the entries, creating key names by stripping off the ObjC "Color" suffix, adds the RCTSelector key referring to the original and then appends these new Swift aliases to the map.
## Changelog
[iOS] [Changed] - Allow iOS PlatformColor strings to be ObjC or Swift UIColor selectors
Pull Request resolved: https://github.com/facebook/react-native/pull/28703
Test Plan:
The PlatformColorExample.js is updated to use the new, shorter Swift selector names. There are still other examples in the same file and in unit tests that exercise the ObjC selector names.
<img width="492" alt="PlatformColor" src="https://user-images.githubusercontent.com/30053638/79809089-89ab7d00-8324-11ea-8a9d-120b92edeedf.png">
Reviewed By: shergin
Differential Revision: D21147404
Pulled By: TheSavior
fbshipit-source-id: 0273ec855e426b3a7ba97a87645859e05bcd4126
Summary:
This diff exports `isPackagerRunning` as a class method to be used without and instance.
Changelog: [Internal]
Reviewed By: cpojer
Differential Revision: D21094414
fbshipit-source-id: 44becb59e3c08d66e4992c4c1b32d6efcd4fe257
Summary:
Before the change, an incorrect (NaN or Inf) values in LayoutMetrics might force an early return in the `updateLayoutMetrics:oldMetrics:` method implementation. This was not correct because the rest of the method also didn't run in this case, so it might force some value to stale.
E.g., imagine we have an instruction that contains NaN size and `display: none`. Previously, the function might just return right before applying sizes and progress the stored "already applied" value of LayoutMetrics which will cause the view being visible even if it should not.
Changelog: [Internal] Fabric-specific internal change.
Reviewed By: JoshuaGross
Differential Revision: D21110644
fbshipit-source-id: 501319d7b1dcd5c18f27e0ceca3c8d207485c49b
Summary:
We need to break up the `uimanager` module in order to solve circular dependencies problem (which future diff would have otherwise).
Changelog: [Internal] Fabric-specific internal change.
Reviewed By: JoshuaGross
Differential Revision: D20885645
fbshipit-source-id: 8148bd934879802b076261ed86fa78acf0a07ed3
Summary:
We need to break up the `uimanager` module in order to solve circular dependencies problem (which future diff would have otherwise).
Changelog: [Internal] Fabric-specific internal change.
Reviewed By: JoshuaGross
Differential Revision: D20885163
fbshipit-source-id: 08eb1ba1d408fc0948e8d0da62380786a40973af
Summary:
This diff introduces a new "Open Debugger" menu item for VMs that support on device debugging and for opening the React DevTools in Flipper. Provided so that we don't drift too far from the Android code.
Changelog: [Internal]
Reviewed By: RSNara
Differential Revision: D20784270
fbshipit-source-id: 6bb16431d25a6c093a583e2e041b8cffa6765ddd
Summary:
Changelog: [Internal]
We don't use view command `setMostRecentEventCount`, let's get rid of it.
Reviewed By: JoshuaGross
Differential Revision: D21016600
fbshipit-source-id: 6491c063e9d6a89252300cb47c010b248e473f4b
Summary:
Now we can control the differentiator mode via MC.
Changelog: [Internal] Fabric-specific internal change.
Reviewed By: fkgozali
Differential Revision: D20978857
fbshipit-source-id: 13264948762f02f874d8d051c873d378062d6db4
Summary:
Calling `-[RCTRedBox showErrorMessage]` twice causes a crash
We used `-[UIViewController isBeingPresented]` to tell whether view controller is already presented.
But from the documentation:
> A Boolean value indicating whether the view controller is being presented.
Source: https://developer.apple.com/documentation/uikit/uiviewcontroller/2097564-beingpresented?language=objc#
---
So this means that if you present it, wait until presentation animation is finished and then call `-[RCTRedBox showErrorMessage]` again, following exception will be thrown.
```
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Application tried to present modally an active controller <UIViewController: 0x7fc33e422f50>.'
```
Changelog: Fix crash caused by presenting view controller twice from RCTRedBox
Reviewed By: PeteTheHeat
Differential Revision: D20946645
fbshipit-source-id: 763066e37db4e56efb0118b2e7867ad0724bae81
Summary:
Changelog: [Internal]
Calling `_backedTextInputView.attributedText = attributedString` causes cursor to be moved to the end of text input.
This applies to both, `UITextField` and `UITextView`.
This is not desired as when JS sets a new text, we don't want the cursor to be moved to the end of text input.
JS has the option to use view commands if it wishes to move cursor somewhere.
Reviewed By: JoshuaGross
Differential Revision: D20836201
fbshipit-source-id: 9234e54cfbc5fc206f723626988e505275788aae
Summary:
Changelog: [Internal]
UIKit uses either `UITextField` or `UITextView` as its UIKit element for `<TextInput>`. `UITextField` is for single line entry, `UITextView` is for multiline entry.
There is a problem with order of events when user types a character.
In `UITextField` (single line text entry), typing a character first triggers `onChange` event and then `onSelectionChange`. JavaScript depends on this order of events because it uses `mostRecentEventCount` from this even to communicate to native that it is in sync with changes in native.
In `UITextView` (multi line text entry), typing a character first triggers `onSelectionChange` and then `onChange`. As JS depends on the correct order of events, this can cause issues. An example would be a TextInput which changes contents based as a result of `onSelectionChange`. Those changes would be ignored as native will throw them away because JavaScript doesn't have the newest version.
Reviewed By: JoshuaGross
Differential Revision: D20836195
fbshipit-source-id: fbae3b6c0d388fc059ca2541ae980073b8e5f6c7
Summary:
This adds a `minimumSize` property to RCTRootView, and forwards any changes to it's shadow view. This **does not** change any default behaviour, as the default minimum size is `CGSizeZero` before & after this diff.
Changelog: [iOS][Internal] Add minimumSize to RCTRootView & RCTRootShadowView
Reviewed By: RSNara
Differential Revision: D20905456
fbshipit-source-id: a03f880e782891f60ef86b9c898965e05a5e796e
Summary:
## Problem
For some reason, D20831545 broke the `use_frameworks!` build of RNTester.
## Building RNTester
```
pushd ~/fbsource/xplat/js/react-native-github/RNTester && USE_FRAMEWORKS=1 pod install && open RNTesterPods.xcworkspace && popd;
```
## Error
I built RNTester locally, and the error was this:
```
Undefined symbols for architecture x86_64:
"facebook::jsi::HostObject::set(facebook::jsi::Runtime&, facebook::jsi::PropNameID const&, facebook::jsi::Value const&)", referenced from:
vtable for facebook::react::ObjCTurboModule in RCTImageEditingManager.o
vtable for facebook::react::ObjCTurboModule in RCTImageLoader.o
vtable for facebook::react::ObjCTurboModule in RCTImageStoreManager.o
"facebook::jsi::HostObject::getPropertyNames(facebook::jsi::Runtime&)", referenced from:
vtable for facebook::react::ObjCTurboModule in RCTImageEditingManager.o
vtable for facebook::react::ObjCTurboModule in RCTImageLoader.o
vtable for facebook::react::ObjCTurboModule in RCTImageStoreManager.o
ld: symbol(s) not found for architecture x86_64
```
## Fix
It looked like libraries that depend on "ReactCommon/turbomodule/core" weren't linking to JSI correctly. So, I modified all such Podspecs to also depend on "React-jsi":
```
arc rfr ' s.dependency "ReactCommon/turbomodule/core", version' ' s.dependency "ReactCommon/turbomodule/core", version\n s.dependency "React-jsi", version'
```
This seemed to do the trick. In buck, we'd fix this problem using exported_dependencies. I skimmed through cocoapods, and couldn't find such a configuration option there. So, I guess this will have to do?
Changelog:
[iOS][Fixed] - Fix Cocoapods builds of RNTester
Reviewed By: fkgozali, hramos
Differential Revision: D20905465
fbshipit-source-id: 60218c8274ec165752a428f2a7a9a546607c8fec
Summary:
Changelog: [Internal]
Setting `_borderLayer.frame` inside `-[RCTViewComponentView layoutSubviews]` causes unwanted animation because it is not wrapped in `CATransaction`.
Moving it to `-[RCTViewComponentView updateLayoutMetrics]` which is called inside `CATransaction`.
Reviewed By: shergin
Differential Revision: D20836890
fbshipit-source-id: 2048a25fd2edb8109f6275c1186c0adae4b9f504
Summary:
This allows the iOS device to be reloaded through the metro command line, besides the fact that whenever packagerServerHost is called, it will only get the IP address once when debugging.
## Changelog
[iOS] [Fixed] - Fixed connection of metro reload command to iOS device
Pull Request resolved: https://github.com/facebook/react-native/pull/28477
Test Plan:
- Build any react-native project in debug mode to an iOS device connected through USB
- Press the “r” key on the terminal that is running metro
- The device should now reload the project
Reviewed By: cpojer
Differential Revision: D20818462
Pulled By: TheSavior
fbshipit-source-id: 6d9792447d205223dad8fbd955518885427cbba8
Summary:
`RCTTurboModuleManager` will create a native `CallInvoker` for each ObjC NativeModule. This `CallInvoker` will be used to dispatch calls from JS to native. Before passing the native `CallInvoker` to the `ObjCTurboModule`, it'll first use `RCTCxxBridge decorateNativeCallInvoker` to get a bridge-aware decorated native `CallInvoker`. That way, the bridge remains informed about async TurboModule method calls that took place since the last time it was flushed. This ensures that we don't end up dispatching `onBatchComplete` any less with TurboModules on than we do with TurboModules off.
Changelog: [Internal]
Reviewed By: fkgozali
Differential Revision: D20831546
fbshipit-source-id: b2eb4e0097e0dabf8c4bd8fdc4c850a0858af699
Summary:
This is the first of three PRs related to enabling multi-bundle support in React Native. More details, motivation and reasoning behind it can be found in RFC [here](https://github.com/react-native-community/discussions-and-proposals/issues/152).
Logic responsible for installing globals was pulled out from `loadApplicationScript` to `initializeRuntime` since it should be ran only once, what was left was renamed to `loadBundle`.
It's based on dratwas work from [here](https://github.com/callstack/react-native/tree/feat/multibundle/split-load-application), but applied to current `master` to avoid rebasing 3-months old branch and issues that come with that.
## Changelog
[Internal] [Changed] - split `loadApplicationScript` into `initializeRuntime` and `loadBundle` to enable multi-bundle support in the future
Pull Request resolved: https://github.com/facebook/react-native/pull/27844
Test Plan: Initialized new RN app with CLI, set RN to build from source and verified the still app builds and runs OK using code from this branch.
Reviewed By: rickhanlonii
Differential Revision: D19888605
Pulled By: ejanzer
fbshipit-source-id: 24ace48ffe8978796591fe7c6cf53a61b127cce6
Summary:
## Context
For now, assume TurboModules doesn't exist.
**What happens when we call an async NativeModule method?**
Everytime JS calls an async NativeModule method, we don't immediately execute it. The legacy infra pushes the call into some queue managed by `MessageQueue.js`. This queue is "flushed" or "emptied" by the following events:
- **Flushed:** A C++ -> JS call. NativeModule async methods can called with an `onSuccess` and/or `onFail` callback(s). Calling `NativeToJsBridge::invokeCallback` to invoke one of these callbacks is one way for ObjC++/C++/Java to call into JS. Another way is via JSModule method calls, which are initiated by `NativeToJsBridge::callFunction`.
- **Flushed:** When `JSIExecutor::flush` is called. Since TurboModules don't exist, this only happens when we call `JSIExecutor::loadApplicationScript`.
- **Emptied:** When more than 5 ms have passed, and the queue hasn't been flushed/emptied, on the next async NativeModule method call, we add to the queue. Afterwards, we empty it, and invoke all the NativeModule method calls.
**So, what's the difference between flushed and emptied?**
> Note: These are two terms I just made up, but the distinction is important.
If the queue was "flushed", and it contained at least one NativeModule method call, `JsToNativeBridge` dispatches the `onBatchComplete` event. On Android, the UIManager module is the only module that listens to this event. This `onBatchComplete` event doesn't fire if the queue was "emptied".
**Why does any of this matter?**
1. TurboModules exist.
2. We need the TurboModules infra to have `JsToNativeBridge` dispatch `onBatchComplete`, which depends on:
- **Problem 1:** The queue being flushed on calls into JS from Java/C++/ObjC++.
- **Problem 2:** There being queued up NativeModule async method calls when the queue is flushed.
In D14656466, fkgozali fixed Problem 1 by making every C++/Java/Obj -> JS call from TurboModules also execute `JSIExecutor::flush()`. This means that, with TurboModules, we flush the NativeModule async method call queue as often as we do without TurboModules. So far, so good. However, we still have one big problem: As we convert more NativeModules to TurboModules, the average size of the queue of NativeModule method calls will become smaller and smaller, because more NativeModule method calls will be TurboModule method calls. This queue will more often be empty than not. Therefore, we'll end up dispatching the `onBatchComplete` event less often with TurboModules enabled. So, somehow, when we're about to flush the NativeModule method call queue, we need `JsToNativeBridge` to understand that we've executed TurboModule method calls in the batch. These calls would have normally been queued, which would have led the queue size to be non-zero. So if, during a batch, some TurboModule async method calls were executed, `JsToNativeBridge` should dispatch `onBatchComplete`.
**So, what does this diff do?**
1. Make `Instance` responsible for creating the JS `CallInvoker`.
2. Make `NativeToJsBridge` responsible for creating the native `CallInvoker`. `Instance` calls into `NativeToJsBridge` to get the native `CallInvoker`.
3. Hook up `CatalystInstanceImpl`, the Android bridge, with the new JS `CallInvoker`, and the new native `CallInvoker`. This fixes `onBatchComplete` on Android. iOS work is pending.
Changelog:
[Android][Fixed] - Ensure `onBatchComplete` is dispatched correctly with TurboModules
Reviewed By: mdvacca
Differential Revision: D20717931
fbshipit-source-id: bc3ccbd6c135b7f084edbc6ddb4d1e3c0c7e0875
Summary:
We are replacing inline-ed implementation with practically the same one implemented as the helper method.
Changelog: [Internal] Fabric-specific internal change.
Reviewed By: sammy-SC
Differential Revision: D20551409
fbshipit-source-id: fcc6f497cd240af65fba534051c217fe5746ce82
Summary:
An evolution of D20633188 but more performant.
There are three optimized paths before the slow path.
The first optimized path tries to pair identical nodes from old/new tree, and generate Update mutations, until we hit nodes that are different (indicating either a remove or an insert). This already existed.
The next two optimizations, introduced by Tim in his JS pseudocode, were inspired by ReactJS's diffing algorithm. They work in cases where the rest of the nodes are (1) all removals/deletes or (2) all creates+inserts.
Finally, if those final two optimized paths can't run, it's because there is a mix of delete+remove, create+insert, and "move" operations, mixed at the beginning, middle, and/or end of the list.
This has slightly better average/best-case complexity as the previous implementation.
In particularly pathological cases where all nodes are arbitrarily reordered, or reversed, for instance (ABCDE->EDCBA) the algorithm has the same complexity as the previous algorithm (quadratic).
For now iOS is pinned to the older differ
Changelog: [Internal] Experiment to optimize diffing algorithm in Fabric
Reviewed By: shergin
Differential Revision: D20684094
fbshipit-source-id: d29fba95a0328156c023e1c87804f23770ee1d91
Summary:
This is another attempt to fix an issue very similar to T59424871. The previous attempt was in D19249490. I don't know why we don't see production crashes (stalls) but it happened to me (and not to me) in the debugger. The previous attempt didn't work because we still could have a deadlock because we tried to acquired shared mutex already owned exclusively by the `suspend` method.
Here is another approach: Instead of using one shared mutex, now we use two. One is similar to what we had and another that protects `suspend` and `resume`. Besides that, now we pass a Scheduler to functions that use that explicitly. This way we can be more explicit about acquiring mutexes and the overall flow of execution. The idea is: Now an arbitrary code that can be reentrant does not cover with mutexes, so the deadlock is not possible.
Changelog: [Internal] Fabric-specific internal change.
Reviewed By: sammy-SC
Differential Revision: D20639228
fbshipit-source-id: 98515742f00f2ae94b50b585c9f1f0611e169ebe
Summary:
`fbsource//xplat` and `//xplat` are equivalent for FB BUCK targets. Removing extra prefix for consistency.
Changelog: [Internal]
Reviewed By: scottrice
Differential Revision: D20495655
fbshipit-source-id: a57b72f694c533e2e16dffe74eccb8fdec1f55f5
Summary:
Logbox has a retain cycle (see linked task for my deeper investigation).
This diff doesn't fix the retain cycle, but it's just good practice to not retain self strongly in blocks.
Changelog: [iOS][Internal] Fix retaining self in block in LogBox implementation
Reviewed By: shergin
Differential Revision: D20630693
fbshipit-source-id: cf399495e9bcd1917932fcc0e9c9d2d2a32bf6f0
Summary:
## Problems
Repro steps:
1. Disable Fabric (because CMD + R doesn't work with Fabric right now).
2. Open up Marketplace and hit `CMD + OPT + R`
3. **Observe:** The progress bar doesn't show up right away. It also doesn't actually show progress.
https://pxl.cl/140g1
RN Support post: https://fb.workplace.com/groups/rn.support/permalink/3437652016283389/
## Fixes
The first problem is that progress bar doesn't actually show progress.
**Fix:** Bundle load progress is updated in `RCTCxxBridge`, where we first require `RCTDevLoadingView`, and then call its `updateProgress` method. Previously, we wouldn't lazily load `RCTDevLoadingView`, it already didn't exist. Lazily loading `RCTDevLoadingView` causes the progress view to show up. Here: https://pxl.cl/140gt
If you look at the above video, you'll notice there are two stages to the progress bar: stage 1 displays the actual progress. Stage 2 prompts that we're downloading the JS bundle. As you can see, stage 1 and stage 2 have different background colors, even though both of them are green.
**Fix:** I adjusted the JS to match the Native color. Here: https://pxl.cl/140gT
We're almost there, but the progress bar is dismissed twice?
**Fix:** I dug into the code, and the reason why was because when we hit `CMD + R`, we invalidate the bridge, and immediately re-initialize it. This means that we asynchronously invalidate the old TurboModuleManager, and immediately create a brand new one. Therefore, two `RCTDevLoadingView` modules can (and do) exist at once. So, I moved `RCTDevLoadingView` to be an instance member of `FBReactModule`, to ensure that it doesn't get cleaned up and re-created when TurboModuleManager is deleted and re-created. This finally fixed the progress bar jank:
https://pxl.cl/140hn
Changelog:
[iOS][Fixed] - Remove RCTDevLoadingView jank
Reviewed By: rickhanlonii
Differential Revision: D20607815
fbshipit-source-id: 05825c67adaf3cfda70be0fa2dc92d413dc8921b
Summary:
The bridge complains if modules aren't exported, which isn't really helpful with lazily loaded modules and turbo modules.
I considered only turning this off when TurboModules is enabled, but figured we'd be killing this soon anyways... If anyone feels strongly I can go that approach.
Changelog: [iOS][Internal] Remove RCTExportModule log spam
Reviewed By: shergin
Differential Revision: D20629575
fbshipit-source-id: d32d9fe244c4d06acfee982fca7c7f63da294dc5
Summary:
Changelog: [Internal]
# There are three changes in this diff
## _stateRevision is replaced with a BOOL
`_stateRevision` was protecting against setting attributed string that is already visible to the user. Previously this was ok because the change was only coming from native, any changes from JS were ignored.
Imagine following scenario:
1. User taps key.
2. Update state is called on component initiated by native.
3. New state is created with incremented revision by one.
4. `_stateRevision` gets set to new state's revision + 1.
5. Now JS wants to change something because it just learnt that user tapped the key.
6. New state is created again with incremented revision by one.
7. Update state is called on the component, but the change isn't applied to the text view because `_state->getRevision()` will equal `_stateRevision`.
By having a BOOL instead of number, we very explicitly mark the region in which we don't want state changes to be applied to text view.
## Calling [_backedTextInputView setAttributedText] move cursor to the end of text input
This is prevented by storing what the current selection is and applying it after `[_backedTextInputView setAttributedText]` is called.
This was previously invisible because JS wasn't changing contents of `_backedTextInputView`.
## Storing of previously applied JS attributed string in state
This is the mechanism used to detect when value of text input changes come from JavaScript. JavaScript sends text input value changes through props and as children of TextInput.
We compare what previously was set from JavaScript to what is currently being send from JavaScript and if they differ, this change is communicated to the component.
Previously only first attributed string send from JavaScript was send to the component.
# Problem
If children are used to set text input's value, then there is a case in which we can't tell what source of truth should be.
Let's take following example
We have a text field that allows only 4 characters, again this is only a problem if those 4 characters come as children, not as value.
This is a controller text input.
1. User types 1234.
2. User types 5th character.
3. JavaScript updates TextInput, saying that the content should stay 1234.
4. In `TextInputShadowNode` `hasJSUpdatedAttributedString` will be set to false, because previous JS value is the same as current JS value.
Reviewed By: shergin
Differential Revision: D20587681
fbshipit-source-id: 1b8a2efabbfa0fc87cba210570142d162efe61e6
Summary:
Changelog: [Internal]
# Fabric
1. If `start` and `end` parameters in `setTextAndSelection` are -1, we don't move the cursor. Previously the cursor would be moved to beginning of text input.
2. In view commands, do not validate `eventCount`. It is passed in as undefined from JS because Fabric's text input doesn't use `eventCount`.
# Paper
1. If `start` and `end` parameters in `setTextAndSelection` are -1, we don't move the cursor. Previously the cursor would be moved to beginning of text input.
Reviewed By: shergin
Differential Revision: D20538290
fbshipit-source-id: c7aeddc25f58697254474058ce901df958321f7c
Summary:
The new prop on RCTParagraphComponentView is meant to be used only by external introspection tools, not the RN core.
Changelog: [Internal] Fabric-specific internal change.
Reviewed By: nscoding
Differential Revision: D20523078
fbshipit-source-id: 4c457d070fd2c172d681c5aa7f731d2d52bba291
Summary:
Changelog: [internal]
layoutDirectionPass down layoutDirection from `RCTSurfacePresenter` down to `YogaLayutableShadowNode`.
In `ParagraphShadowNode`, we propagate layoutDirection from yoga node to `TextAttributes.layoutDirection`.
Reviewed By: shergin
Differential Revision: D20420041
fbshipit-source-id: 86e01d31ea9415acb8579c44c470cac870ec1b8f
Summary:
Changelog: [Internal]
# Problem
SafeAreaView is getting reused, its previous `safeAreaInsets` is top: 44, bottom: 34 so `safeAreaInsetsDidChange` doesn't get called because it doesn't change. Therefore state gets never updates because `safeAreaInsetsDidChange` is never called.
# Solution
Update state whenever a new state is assigned.
Reviewed By: shergin
Differential Revision: D20444198
fbshipit-source-id: 75d1458450c70d74647df4962ddad88d5f6a38d2
Summary:
Changelog: [internal]
# Problem
Assigning `CALayer.contents` implicitly animates the difference. As we keep `UIView` in recycle pool between usages, they keep their previous state. This was causing animation of border when the views were being reused.
# Solution
Wrapping application of mutations in `CATTransaction`.
Reviewed By: shergin
Differential Revision: D20442045
fbshipit-source-id: 214d6c422f23f399dec46b5bf1a38a7b64758160
Summary:
Now we have `zIndex` feature implemented in the Core, we don't need to take `view.layer.zIndex` into account when we do hit-testing, so now we don't need to sort *all subviews* on *all levels of hierarchy* every time we process touch down event.
Changelog: [Internal] Fabric-specific internal change.
Reviewed By: sammy-SC
Differential Revision: D20425987
fbshipit-source-id: 025bd968ae948b9b0a4188845efc0de950fb5cdf
Summary:
Now we have `zIndex` feature implemented in the Core, we don't need to have it implemented on the mounting layer.
Changelog: [Internal] Fabric-specific internal change.
Reviewed By: sammy-SC
Differential Revision: D20432156
fbshipit-source-id: f77b96919bab21b6628472b9fe58c5f4e3233318
generatedunixname89002005287564
Tom Underhill
Rick Hanlon
Samuel Susla
Valentin Shergin
Ramanpreet Nara
Kevin Gozali
Scott Wolchok
Peter Argany
Hein Rutjes
Cristiano Santos
maciej simka
Emilis Baliukonis
Joshua Gross
Max Ovtsin
