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[Mobile] - Prevent passing potential false values to the onPress prop #60595

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merged 5 commits into from
Apr 11, 2024

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@geriux geriux commented Apr 9, 2024

What?

This PR aims to fix a potential crash where it appears an onPress prop has a false value.

Why?

There are a few crash events on low-end devices where the editor crashes in the Pressability component of React Native. After several different investigations, we haven't found reproducible steps of this problem.

How?

This PR prevents passing optional values to the onPress prop of the ButtonBlockAppender component and MediaEdit button in the Cover block.

With these changes, a function will always be passed with checks to prevent passing potential false values.

Testing Instructions

Note

It's recommended to smoke test the following as there are no reproducible steps

ButtonBlockAppender - Test case 1

  • Open the app with metro running
  • Tap on the + button to add a block
  • Expect the block to be added

ButtonBlockAppender - Test case 2

  • Open the app with metro running
  • Tap on the + button to add a Columns block
  • Select the first Column
  • Tap on the inline + appender button and add a block
  • Expect the block to be added

ButtonBlockAppender - Test case 3

  • Open the app with metro running
  • Tap on the + button to add a Buttons block
  • Tap on the inline + appender button and add another Button block
  • Expect the block to be added

Cover Block MediaEdit

  • Open the app with metro running
  • Tap on the + button and add a Cover block
  • Tap a color from the inline color palette of the block
  • Select the parent Cover block
  • Tap on the top-right MediaEdit button
  • Expect the picker to show up

Testing Instructions for Keyboard

N/A

Screenshots or screencast

ButtonBlockAppender

ButtonBlockAppender.mov

Cover Block MediaEdit

MediaEdit.mov

@geriux geriux added [Type] Bug An existing feature does not function as intended Mobile App - i.e. Android or iOS Native mobile impl of the block editor. (Note: used in scripts, ping mobile folks to change) labels Apr 9, 2024
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github-actions bot commented Apr 9, 2024

Size Change: 0 B

Total Size: 1.75 MB

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compressed-size-action

@geriux geriux changed the title [Mobile] - Prevent passing false values to the onPress prop [Mobile] - Prevent passing potential false values to the onPress prop Apr 10, 2024
@geriux geriux marked this pull request as ready for review April 10, 2024 10:40
@geriux geriux requested a review from twstokes April 10, 2024 10:41
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LGTM @geriux. 🚀

# Conflicts:
#	packages/react-native-editor/CHANGELOG.md
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@geriux geriux merged commit 2668051 into trunk Apr 11, 2024
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@geriux geriux deleted the fix/prevent-undefined-on-press branch April 11, 2024 15:50
@github-actions github-actions bot added this to the Gutenberg 18.2 milestone Apr 11, 2024
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@geriux for my own education, would you mind sharing how you identified these specific lines to change/guard?

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geriux commented Apr 30, 2024

@geriux for my own education, would you mind sharing how you identified these specific lines to change/guard?

Of course!

Well, I'm still waiting to see if we don't get any new reports since I couldn't reproduce it, but hopefully, this would address it.

From the crash reports, the code line being referenced was the following:

/workdir/gutenberg/node_modules/react-native/Libraries/Pressability/Pressability.js:789:onPress

So I then looked through all of the code base and the usage of the onPress prop to see what values we were setting, I remembered in a previous app I used to work, we had issues when having conditionals within the onPress callbacks and potentially setting undefined or Boolean values for example onClick={ onAddBlock || onToggle }. So I went through each one to see if there might be cases where the onPress value wouldn't be valid.

My gut feeling is that there are cases where users tap several times potentially on low-end devices while UI items are being re-rendered causing the app to crash when there's an invalid value set in the onPress prop. My take is on the appender button but I also thought about the picker reference.

My idea with this PR was to see if this could be the case, if we still get crash reports then it would have to be something unrelated to the onPress.

Thanks for asking about it and let me know if you have any other questions!

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Mobile App - i.e. Android or iOS Native mobile impl of the block editor. (Note: used in scripts, ping mobile folks to change) [Type] Bug An existing feature does not function as intended
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