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Fluid typography: do not calculate fluid font size when min and max viewport widths are equal #57866

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merged 2 commits into from
Jan 16, 2024

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@ramonjd ramonjd commented Jan 16, 2024

What?

When the same value is provided for min and max viewport widths in the fluid typography config, return early.

Kudos to @josephscott for catching this.

Core patch:

Why?

To avoid dividing by zero values. PHP will throw an error and, besides, the fluid typography clamp rule needs valid max and min viewport constraints.

Alternatives to this approach:

  1. We could provide a fallback from the default values in gutenberg_get_typography_font_size_value(), e.g., 1600 - 320.

Testing Instructions

The error is triggered when the min and max viewport widths are equal.

Here is some test theme.json

{
	"$schema": "https://schemas.wp.org/trunk/theme.json",
	"version": 2,
	"settings": {
		"appearanceTools": true,
		"layout": {
			"contentSize": "840px",
			"wideSize": "1100px"
		},
		"typography": {
			"fluid": {
				"minFontSize": "16px",
				"maxViewportWidth": "1640px",
				"minViewportWidth": "1640px"
			},
			"fontSizes": [
				{
					"name": "heading",
					"slug": "heading",
					"size": "20px"
				}
			]
		}
	},
}

Check that font-sizes are not fluid.

Important

In the Editor things will be appear broken because, via wp-admin/edit-form-blocks.php Core is running theme.json through the Theme_Json class, which will call Core wp_ typography functions.

Here's the expected error:

PHP error in the editor
Fatal error: Uncaught DivisionByZeroError: Division by zero in /var/www/html/wp-includes/block-supports/typography.php:476 Stack trace: #0 /var/www/html/wp-includes/block-supports/typography.php(628): wp_get_computed_fluid_typography_value(Array) #1 /var/www/html/wp-includes/class-wp-theme-json.php(1732): wp_get_typography_font_size_value(Array) #2 /var/www/html/wp-includes/class-wp-theme-json.php(1812): WP_Theme_JSON::get_settings_values_by_slug(Array, Array, Array) #3 /var/www/html/wp-includes/class-wp-theme-json.php(1549): WP_Theme_JSON::compute_preset_vars(Array, Array) #4 /var/www/html/wp-includes/class-wp-theme-json.php(1087): WP_Theme_JSON->get_css_variables(Array, Array) #5 /var/www/html/wp-includes/global-styles-and-settings.php(206): WP_Theme_JSON->get_stylesheet(Array, Array) #6 /var/www/html/wp-includes/block-editor.php(511): wp_get_global_stylesheet(Array) #7 /var/www/html/wp-admin/edit-form-blocks.php(284): get_block_editor_settings(Array, Object(WP_Block_Editor_Context)) #8 /var/www/html/wp-admin/post.php(187): require('/var/www/html/w...') #9 {main} thrown in /var/www/html/wp-includes/block-supports/typography.php on line 476

There's a Core patch you can run to get everything working.

E.g., if using wp-env use a .wp-env.override.json override file to point to the WordPress source

{
	"core": "../wordpress-develop/src",
	"plugins": [ "." ]
}

…e fluid typography config, do not calculate fluid typography values and return null. We could provide a fallback from the default values in gutenberg_get_typography_font_size_value() but I think it might be better to bypass returning clamp values altogether because fundamentally, the input is wrong.
@ramonjd ramonjd added [Type] Bug An existing feature does not function as intended Needs PHP backport Needs PHP backport to Core [Feature] Typography Font and typography-related issues and PRs labels Jan 16, 2024
@ramonjd ramonjd self-assigned this Jan 16, 2024
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This pull request has changed or added PHP files. Please confirm whether these changes need to be synced to WordPress Core, and therefore featured in the next release of WordPress.

If so, it is recommended to create a new Trac ticket and submit a pull request to the WordPress Core Github repository soon after this pull request is merged.

If you're unsure, you can always ask for help in the #core-editor channel in WordPress Slack.

Thank you! ❤️

View changed files
❔ lib/block-supports/typography.php
❔ phpunit/block-supports/typography-test.php

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github-actions bot commented Jan 16, 2024

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Total Size: 1.69 MB

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Comment on lines 413 to 415
$linear_factor = ! empty( $linear_factor_denominator ) ? 100 * ( ( $maximum_font_size['value'] - $minimum_font_size['value'] ) / ( $linear_factor_denominator ) ) : 0;
$linear_factor_scaled = round( $linear_factor * $scale_factor, 3 );
$linear_factor_scaled = empty( $linear_factor_scaled ) ? 1 : $linear_factor_scaled;
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Would this be more readable?

if ( ! empty( $linear_factor_denominator ) ) {
    $linear_factor = 100 * ( ( $maximum_font_size['value'] - $minimum_font_size['value'] ) / ( $linear_factor_denominator ) );
    $linear_factor_scaled = round( $linear_factor * $scale_factor, 3 );
} else {
    $linear_factor_scaled = 1;
}

$linear_factor_scaled = empty( $linear_factor_scaled ) ? 1 : $linear_factor_scaled;

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Slightly! That looks a bit more readable to me since it reduces a bit of the complexity in a single line 👍

I don't feel strongly about it either way, though!

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Thanks for getting a PR up so quickly!

While testing, I found that the fluid typography output felt a bit unexpected to me as the resulting font-size seemed to always be very far away from the one I entered into the block editor. For example, if I set a block's font-size to 48px, then with * 1, it never gets close to being 48px despite the viewport size. In practice, it winds up being 27.894px to 32.458px:

2024-01-16.16.12.46.mp4

Not calculate fluid typography values and return null.

Because of the above, I think I'd lean toward an early return actually, and skip fluid typography output when the min and max viewport are the same.


Separately to this PR, I noticed that it looks like Fluid typography rules currently aren't working for custom values within the block editor. From a bit of digging, it looks like maybe the fluid typography calls aren't happening within useBlockProps here 🤔 :

function useBlockProps( { name, fontSize, style } ) {

image

That last bug isn't a blocker for this PR, but just thought I'd mention it while I notice it.

I've run out of time to keep digging today, but happy to help out with this tomorrow!

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Separately to this PR, I noticed that it looks like Fluid typography rules currently aren't working for custom values within the block editor.

Added a comment over on #56912 (review) where I think the issue was introduced. Not quite sure what the right fix is 🤔

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ramonjd commented Jan 16, 2024

Because of the above, I think I'd lean toward an early return actually, and skip fluid typography output when the min and max viewport are the same.

I should have listened to my first commit 29cf213

I'll revert. Thanks for the quick test!

@ramonjd ramonjd force-pushed the fix/fluid-typography-same-viewport-values branch from 23baf65 to 29cf213 Compare January 16, 2024 05:44
@ramonjd ramonjd changed the title Fluid typography: provide fallback for linear scale where min and max viewport widths are equal Fluid typography: do not calculate fluid font size when min and max viewport widths are equal Jan 16, 2024
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Thanks for the follow-up! Looking good now, when the two values match, the fluid rules are now skipped:

image

Also double-checked that fluid typography is otherwise working as on trunk for when the min/max viewport sizes are different.

LGTM! ✨

@andrewserong andrewserong merged commit 6c0cd11 into trunk Jan 16, 2024
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@andrewserong andrewserong deleted the fix/fluid-typography-same-viewport-values branch January 16, 2024 23:44
@github-actions github-actions bot added this to the Gutenberg 17.6 milestone Jan 16, 2024
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ramonjd commented Jan 17, 2024

Another one I owe you @andrewserong

🙏

@getdave getdave added Backported to WP Core Pull request that has been successfully merged into WP Core and removed Needs PHP backport Needs PHP backport to Core labels Jan 23, 2024
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getdave commented Jan 23, 2024

✅ I updated this PR with the Backported to Core label to indicate that the backport has successfully merged into WP Core. I also updated the PHP Sync Tracking Issue for WP 6.5.

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Backported to WP Core Pull request that has been successfully merged into WP Core [Feature] Typography Font and typography-related issues and PRs [Type] Bug An existing feature does not function as intended
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3 participants