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Rich text: remove preserveWhiteSpace serialisation differences #55999

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merged 7 commits into from
Nov 10, 2023

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@ellatrix ellatrix commented Nov 9, 2023

What?

This PR adjusts the preserveWhiteSpace prop from rich text, which was being used for the Preformatted, Code, and Verse blocks. We don't have to continuously collapse whitespace inside rich text on value changes, and we don't need it for serialisation. Additionally, it's no longer needed for splitting/merging all instances serialise the same way.

Why?

  1. This regex to remove whitespace is being continuously run on typing, so this impacts performance positively.
  2. This setting (along with multiline, which has recently been removed) is a pain to work with. Currently, to parse and serialised rich text content (with create and toHTMLString), you need to know where this HTML came from (an instance that preserves white space or not). This required us to add a special setting to the block attribute definition, so we can properly handle merging and splitting. Now all rich text values serialise the same way, with line breaks always serialising to the HTML BR tag.

How?

As said before, we can rely on the initial HTML parse and the paste handler to remove superfluous white space. The logic in the paste handler was introduces in #17470, much after we added this preserveWhiteSpace prop to rich text.

Additionally, for line break serialisation, it should be safe to use proper line break elements for rich text instances. It's worth noting that Preformatted, Code, and Verse use rich text components, allowing HTML formatting like bold, links, etc., so line break HTML elements are not odd. If we don't want any HTML elements, we should use the plain text component instead, which outputs line breaks as simple text line breaks.

Testing Instructions

We have lots of e2e test coverage, so we should be good. Mainly check the Preformatted, Code, and Verse blocks.

Testing Instructions for Keyboard

Screenshots or screencast

@ellatrix ellatrix added [Type] Performance Related to performance efforts [Type] Code Quality Issues or PRs that relate to code quality [Feature] Rich Text Related to the Rich Text component that allows developers to render a contenteditable [Feature] Paste labels Nov 9, 2023
let valueB = create( {
html: htmlB,
...mapRichTextSettings( attributeDefinitionB ),
} );
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Like I said, a pain to work with.

* @param {string} string
*/
function collapseWhiteSpace( string ) {
return string.replace( /[\n\r\t]+/g, ' ' );
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This is sort of replaced by logic in the paste handler

let newData = node.data.replace( /[ \r\n\t]+/g, ' ' );

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github-actions bot commented Nov 9, 2023

Size Change: -229 B (0%)

Total Size: 1.7 MB

Filename Size Change
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build/block-library/index.min.js 212 kB +33 B (0%)
build/blocks/index.min.js 51.5 kB -23 B (0%)
build/edit-site/index.min.js 209 kB +30 B (0%)
build/editor/index.min.js 46 kB -15 B (0%)
build/rich-text/index.min.js 10.2 kB -50 B (0%)
ℹ️ View Unchanged
Filename Size
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compressed-size-action

@ellatrix ellatrix removed the [Type] Performance Related to performance efforts label Nov 9, 2023
@ellatrix ellatrix force-pushed the remove/rich-text-preserve-whitespace branch from 2cd0b0f to e11bc4c Compare November 9, 2023 16:53
@ellatrix ellatrix marked this pull request as ready for review November 9, 2023 17:46
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I've been testing this with the Playground and can't find a way to break it.

I explored variations of whitepspace and conversion to and from a paragraph, code block, HTML block.

The only thing that stood out to me was that my spaces were preserved inside the editor for the paragraph but obviously didn't remain in the rendered post. I would have expected successive spaces in the editor (for example, typing this alignment) would produce HTML that preserves those spaces, such as with a non-breaking space. Since this happens in trunk it's not a blocker or even a comment about this change specifically.

While reviewing I did wonder what our reason has been for removing whitespace at all. If we don't preserve the intent or entered text from the editor to the rendered page, why modify it at all? Exploring the DOM inside the browser revealed that the browser doesn't modify textContent to remove extra whitespace, and I couldn't find any way to make it do it, even with calls to .normalize() and .cloneNode(). In other words, if browsers handle the whitespace and the editor has is own rules, what are we trying to accomplish by messing with whitespace?

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That's because we have white space: pre-wrap turned on for all rich text instances. I'll try to remove it in 587dede.

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github-actions bot commented Nov 10, 2023

Flaky tests detected in 2ef1e3a.
Some tests passed with failed attempts. The failures may not be related to this commit but are still reported for visibility. See the documentation for more information.

🔍 Workflow run URL: https://github.com/WordPress/gutenberg/actions/runs/6826391569
📝 Reported issues:

@ellatrix ellatrix force-pushed the remove/rich-text-preserve-whitespace branch from 587dede to 0c26493 Compare November 10, 2023 13:54
@ellatrix ellatrix changed the title Rich text: "auto" preserve whitespace Rich text: remove preserve whitespace serialisation differences Nov 10, 2023
@ellatrix ellatrix changed the title Rich text: remove preserve whitespace serialisation differences Rich text: remove preserveWhiteSpace serialisation differences Nov 10, 2023
@ellatrix ellatrix merged commit 8133186 into trunk Nov 10, 2023
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FYI: This change apparently broke my Syntax-highlighting Code Block plugin, since the <pre> contents no longer contain newlines but rather <br> tags: westonruter/syntax-highlighting-code-block#790

I have a workaround to replace all <br> with \n before doing the server-side highlighting.

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ellatrix commented Mar 5, 2024

@westonruter Worth nothing that the RichText and the code block can contain any HTML formatting. If you create a custom block and don't want formatting, you should ideally use the PlainText component (v2).

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@ellatrix Thanks. Good point. However, I'm hoping to retain the ability to do HTML formatting and have syntax highlighting (westonruter/syntax-highlighting-code-block#205), likely facilitated with the HTML Tag Processor. If I fail at that, I'll go with what you suggest.

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dmsnell commented Mar 6, 2024

This change apparently broke my Syntax-highlighting Code Block plugin, since the <pre> contents no longer contain newlines but rather <br> tags

@westonruter are you looking to render the contents of the PRE element verbatim as code? if so, I'm not sure that's a reliable method anyway. the PRE element doesn't add any semantic to its contents other than that they should be monospace-rendered.

have you looked at storing the contents in a disabled TEXTAREA? or have you tried first decoding the contents on the server? if we interpret the PRE contents appropriately I wonder if the problem would persist? that's now doable with the HTML API in 6.5. does the syntax highlighter have the same struggles with encoded characters?

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