feat: fix show soft input on focus behavior

[christianwen]

Summary

The showSoftInputOnFocus of TextInput is not working properly. When we set showSoftInputOnFocus to false and subsequently to true, it fails to open the keyboard, we have to re-focus on the input in order for the keyboard to show. It's expected that the keyboard will be opened as soon as showSoftInputOnFocus becomes true. This happens on iOS only.
Reference in React Native doc: https://reactnative.dev/docs/textinput#showsoftinputonfocus.

Changelog

[iOS] [Fixed] - Fix issue where keyboard does not open when TextInput showSoftInputOnFocus changes from false to true

Test Plan

I've made a clean create-react-native-app repo to demonstrate this https://github.com/christianwen/reduced-rn-app.
Here's the steps:

1. Clone https://github.com/christianwen/reduced-rn-app
2. Run yarn install
3. Run cd ios, then pod install, then cd ..
4. Run yarn ios
5. See the text input on the top of the screen, it can be observed that the keyboard does not open because showSoftInputOnFocus is false, 3 seconds later it becomes true due to a setTimeout that is used

Screen.Recording.2022-11-07.at.23.42.11.mov

However, it can be seen that the keyboard does not open even though showSoftInputOnFocus becomes true
6. Now add the change in this PR to Libraries/Text/TextInput/RCTBaseTextInputView.m
7. Run yarn ios again
8. Now verify the step 5 again, the keyboard will open automatically when showSoftInputOnFocus becomes true

Simulator.Screen.Recording.-.iPhone.14.-.2022-11-07.at.23.32.01.mp4

The reason why I created a fresh RN repo instead of using rn-tester app is because the showSoftInputOnFocus example is not working in rn-tester app for some reasons (it shows the keyboard even though showSoftInputOnFocus is false in the example).

Regarding the code, it's similar to the fix for keyboardType in 8baaacb.

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	6,995,344	-70,833
android	hermes	armeabi-v7a	6,371,882	-66,679
android	hermes	x86	7,408,031	-73,464
android	hermes	x86_64	7,272,040	-68,849
android	jsc	arm64-v8a	8,861,159	-70,836
android	jsc	armeabi-v7a	7,599,671	-66,668
android	jsc	x86	8,918,904	-73,462
android	jsc	x86_64	9,402,268	-68,853

Base commit: 6152763
Branch: main

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
ios	-	universal	n/a	--

Base commit: 6152763
Branch: main

[pull-bot]

PR build artifact for 42472db is ready.
To use, download tarball from "Artifacts" tab in this CircleCI job then run yarn add <path to tarball> in your React Native project.

[facebook-github-bot]

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