Font Size Control Has No Effect When “Fit text” Is Enabled

[kjnanda]

Description

When the “Fit text” toggle is enabled for the Stretchy Paragraph or Stretchy Heading block, adjusting the Font Size (S, M, L, XL, XXL) under the Typography settings has no visible effect on the text.

This behavior is understandable since Fit text dynamically scales text to fit its container. However, keeping the font size options active may create confusion, as users might assume the control is not working.

Step-by-step reproduction instructions

1. Add a Stretchy Paragraph or Stretchy Heading block.
2. Open the Block settings → Typography panel.
3. Enable the Fit text toggle.
4. Attempt to change the Font Size value (e.g., from S to XXL).
5. Observe that the text size remains unchanged.

Screenshots, screen recording, code snippet

Stretchy.block.issue.mov

Environment info

Tested this with #71904 using the playground link.

• WordPress: 6.8.3
• PHP: 8.3.25-dev
• Server: PHP.wasm
• Database: WP_SQLite_Driver (Server: 5.5 / Client: 3.40.1)
• Browser: Chrome 141.0.0.0
• OS: macOS
• Theme: Twenty Twenty-Five 1.3
• MU Plugins: None activated
• Plugins:
  • Gutenberg 21.8.0-rc.1
  • Test Reports 1.2.0

Please confirm that you have searched existing issues in the repo.

• Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

• Yes

Please confirm which theme type you used for testing.

• Block
• Classic
• Hybrid (e.g. classic with theme.json)
• Not sure

[sidharthpandita1]

Suggested minimal fix @t-hamano
Disable the Font Size control while Fit text is enabled and show a small helper or tooltip: “Disabled while Fit text is enabled — Fit text dynamically scales type to the container.
any suggestions?

[t-hamano]

Disable the Font Size control while Fit text is enabled and show a small helper or tooltip

I like the idea.

@jorgefilipecosta @ntsekouras @scruffian @mcsf What do you think?

[ntsekouras]

Maybe adding to fit text control's help text that font size setting is overridden when enabled could be enough. This way we don't interconnect the two controls in code.

[sidharthpandita1]

Screen.Recording.2025-10-14.at.2.30.53.AM.mov

alternatively we can just hide the block completely
@t-hamano @ntsekouras

[jorgefilipecosta]

@sidharthpandita1, I proposed a solution that hides the font size picker completly as it is irrelevant when fit text is enabled #72492.
I think your PR #72303 is still important as we should also change the help message so both should merged.