Wrapping Heading block text overlaps previous lines for block-based themes

[dcalhoun]

Description

When adding a Heading block in the native mobile editor, the line height is incorrect and results in overlapping lines of text. It would appear an incorrect line height is set for the Heading block.

This issue only occurs in development environments at the time of writing. This issue occurs in the latest v1.67.0 release and first occurred in v1.64.0. It only occurs on Android, not iOS. It is likely related to #35314.

Step-by-step reproduction instructions

1. Set the current theme to Geologist.
2. Add a Heading block to the editor.
3. Type enough words to wrap the text to a second line.

Expected behaviour

The wrapped second line of text does overlaps the first line of text.

Actual behaviour

The wrapped second line of text does not overlap the first line of text.

Screenshots or screen recording (optional)

WordPress information

• WordPress version: WordPress.com
• Gutenberg version: v12.0.1
• Are all plugins except Gutenberg deactivated? Yes
• Are you using a default theme (e.g. Twenty Twenty-One)? No, Geologist

Device information

• Device: Samsung Galaxy S20
• Operating system: Android 11
• WordPress app version: Gutenberg Mobile v1.67.0

[dcalhoun]

@geriux do you think this may be related to #35314?

[hypest]

but not in the latest WordPress mobile app release (18.8)

👋 @dcalhoun! Trying to understand the setup, do you mean that the production WP app doesn't exhibit the issue? And since I see the screenshot in the ticket being from WPAndroid, does that mean the app was pointing to a running Metro server and thus, exhibiting the issue? Thanks!

[dcalhoun]

👋 @dcalhoun! Trying to understand the setup, do you mean that the production WP app doesn't exhibit the issue? And since I see the screenshot in the ticket being from WPAndroid, does that mean the app was pointing to a running Metro server and thus, exhibiting the issue?

@hypest I believe the font size feature resides behind a development flag. So, the issue is not present in a packaged release, but is present when connected to a Metro server. I will update the Issue description to improve clarity.

[geriux]

Hey there 👋 I'm working on a fix for this issue, as @dcalhoun mentioned this is behind a development flag so this is not happening on production. Thanks for finding this bug! 🙇