react / react/react-native

Emojis inside <Text> increase line-height or stretch the element on iOS

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#47,621 14 comments 2 reactions 0 assignees View on GitHub

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Needs: Triage :mag: Newer Patch Available Platform: iOS
Dominant language
C++
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Description

Description

Reported previously in #18559. Emojis within <Text> elements are not aligned with other text in the same text element or other text elements on screen. They also cause the height of the <Text> to increase disproportionate to the fontSize.

As a workaround, the fontFamily of the emoji can be set to System. The referenced Snack shows this behavior. The emoji is rendered initially with the Menlo font family and overridden to System when the override button is pressed. When overridden, the strikethrough more closely aligns with the text, though is not perfectly aligned like on Android.

This issue no longer seems to be reproducible on Android.

Steps to reproduce
  1. Launch the Snack
  2. Note that the strikethrough does not align with the emoji nor the text to the right
  3. Click Override
  4. Note that the strikethrough more closely aligns with the emoji and the text on the right
React Native Version

0.76.1

Affected Platforms

Runtime - iOS

Output of npx react-native info
System:
  OS: macOS 14.7.1
  CPU: (16) arm64 Apple M3 Max
  Memory: 3.73 GB / 48.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 18.20.5
    path: /opt/homebrew/opt/node@18/bin/node
  Yarn:
    version: 1.22.22
    path: /opt/homebrew/bin/yarn
  npm:
    version: 10.8.2
    path: /opt/homebrew/opt/node@18/bin/npm
  Watchman:
    version: 2024.11.11.00
    path: /opt/homebrew/bin/watchman
Managers:
  CocoaPods:
    version: 1.16.2
    path: /opt/homebrew/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 24.1
      - iOS 18.1
      - macOS 15.1
      - tvOS 18.1
      - visionOS 2.1
      - watchOS 11.1
  Android SDK: Not Found
IDEs:
  Android Studio: Not Found
  Xcode:
    version: 16.1/16B40
    path: /usr/bin/xcodebuild
Languages:
  Java: Not Found
  Ruby:
    version: 2.6.10
    path: /usr/bin/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 15.1.2
    wanted: ^15.1.2
  react:
    installed: 18.3.1
    wanted: 18.3.1
  react-native:
    installed: 0.76.1
    wanted: 0.76.1
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: Not found
  newArchEnabled: Not found
iOS:
  hermesEnabled: Not found
  newArchEnabled: Not found
Stacktrace or Logs
None
Reproducer

https://snack.expo.dev/@mhoran/hazardous-orange-celery

Screenshots and Videos
Without override With override
Screenshot 2024-11-14 at 4 02 20 PM Screenshot 2024-11-14 at 4 02 27 PM

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the linked Snack on iOS and compare the emoji behavior in with Menlo and System fontFamily settings. Trace the iOS text-rendering path responsible for line height and alignment; done means emoji no longer stretches or misaligns the text without regressing the Android behavior.

Written by the indexing model from the issue text.

Assessment

Tech stack
ios, react-native
Domain
mobile
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
42/100

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