iOS | RN 0.62.2 | The text in the Multiline TextInput starts "jerking" when moving the cursor over it with a long press on the spacebar

Description

On iOS devices, if you add a lot of lines to a multi-line TextInput and then hold down the space bar and try to move the cursor to the desired point, the text starts jerking.

React Native version:

RN: 0.62.2 (also reproducible in 0.63.3) Tested on iPhone 12 pro max (14.3), iPad Pro 9.7 (13.7) and simulators

Steps To Reproduce

1. Create multi-line TextInput field
2. Add a lot of lines
3. On iOS devices hold down the space bar and try to move the cursor to the desired point in the text
4. The text starts jerking, it is impossible to move the cursor to the desired point in the text

Expected Results

On iOS devices in a multi-line TextInput user should be able to move the cursor to the desired point in the text.

Snack, code example, screenshot, or link to a repository:

render() {
    return (
      <View
        style={{
          flex: 1,
          flexDirection: 'column',
          paddingTop: 70,
          paddingHorizontal: 20,
          alignItems: 'center',
          justifyContent: 'center',
        }}
      >
        <Text style={{ fontSize: 22, fontWeight: '600', marginBottom: 10 }}>
          Multiline TextInput iOS test
        </Text>
        <TextInput
          style={{
            height: 150,
            fontSize: 16,
            width: '90%',
            borderColor: 'gray',
            borderWidth: 1,
            paddingLeft: 5,
            paddingRight: 5,
          }}
          placeholder="Type multiline text here..."
          multiline
        />
      </View>
    );
  }

[xiankuncheng]

Hi @artyom4ek, I’ve raised this PR to fix this issue. I’ve tried on iOS 14 (device), iOS 13 (simulator), and seems to be fixed. Would love your help to verify it if possible 🙏.

Also huge thanks for @efstathiosntonas, the PR created based on your suggestion and investigation ❤️

[efstathiosntonas]

@xiankuncheng great job, thank you. It’s really weird that this issue was under estimated for so long, users were complaining on a daily basis.

Edit: I ll test it tomorrow on iOS 15 device and emulators