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Disable the ability select text in the useBlockPreview hook #47331

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@t-hamano t-hamano commented Jan 21, 2023

Fixes: #47293

What?

This PR fixes a bug that caused multiple rendering of controls when a block was selected in the site editor. This problem, as reported in #47293, seems to occur sometimes when selecting a block in a post template.

Why?

I have confirmed that this problem doesn't occur when the Gutenberg plugin is disabled. I can't explain the root cause, but I noticed the following different style attributes in the rendering of the post template.

<!-- Gutenberg Plugin Activated -->
<ul class="wp-block-post-template">
  </li>
  <li class="wp-block-post block-editor-block-preview__live-content components-disabled" style="display: none;">
  </li>
  <li class="wp-block-post block-editor-block-preview__live-content components-disabled">
  </li>
  <li class="wp-block-post block-editor-block-preview__live-content components-disabled">
  </li>
</ul>

<!-- Gutenberg Plugin Deactivated -->
<ul class="wp-block-post-template">
  <li class="wp-block-post block-editor-block-list__layout">
  </li>
  <li class="wp-block-post block-editor-block-preview__live-content components-disabled" style="user-select: none; display: none;">
  </li>
  <li class="wp-block-post block-editor-block-preview__live-content components-disabled" style="user-select: none;">
  </li>
  <li class="wp-block-post block-editor-block-preview__live-content components-disabled" style="user-select: none;">
  </li>
</ul>

In other words, I thought that the user-select:none; style should always be applied to the li.wp-block-post block-editor-block-preview__live-content element in order to achieve the expected behavior.

How?

Added user-select: none; in the .block-editor-block-preview__live-content selector.

As an alternative approach, I have confirmed that the following changes will also solve the problem.

--- a/packages/block-library/src/post-template/edit.js
+++ b/packages/block-library/src/post-template/edit.js
@@ -52,6 +52,7 @@ function PostTemplateBlockPreview( {
 
        const style = {
                display: isHidden ? 'none' : undefined,
+               userSelect: 'none',
        };
 
        return (

Testing Instructions

  • Open the site editor.
  • In edit mode, repeat the click in the post template block.
  • Make sure no duplicate controls appear.

@t-hamano t-hamano self-assigned this Jan 21, 2023
@t-hamano t-hamano added [Type] Bug An existing feature does not function as intended [Feature] Site Editor Related to the overarching Site Editor (formerly "full site editing") labels Jan 21, 2023
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github-actions bot commented Jan 21, 2023

Size Change: +3.85 kB (0%)

Total Size: 1.33 MB

Filename Size Change
build/block-editor/content-rtl.css 3.67 kB +17 B (0%)
build/block-editor/content.css 3.67 kB +17 B (0%)
build/block-editor/index.min.js 190 kB +472 B (0%)
build/block-editor/style-rtl.css 14.3 kB +122 B (+1%)
build/block-editor/style.css 14.3 kB +119 B (+1%)
build/block-library/index.min.js 200 kB +779 B (0%)
build/core-data/index.min.js 15.9 kB -36 B (0%)
build/edit-site/index.min.js 62.9 kB +1.27 kB (+2%)
build/editor/index.min.js 45.2 kB +1.1 kB (+2%)
ℹ️ View Unchanged
Filename Size
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compressed-size-action

@t-hamano t-hamano changed the title Block Editor: Try to fix multiple rendering of controls Block Preview: Try to fix multiple rendering of controls Jan 21, 2023
@t-hamano t-hamano marked this pull request as ready for review January 21, 2023 16:14
@t-hamano t-hamano requested review from ntsekouras, youknowriad and tellthemachines and removed request for ellatrix January 21, 2023 16:14
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github-actions bot commented Jan 21, 2023

Flaky tests detected in 932e8e2.
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/3986580713
📝 Reported issues:

@youknowriad
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Thanks for the PR, I have two questions here:

  • isn't Disabled component supposed to disable interactions already within previews?
  • The other thing is that there might be another issue here causing the duplicate toolbars as toolbars are only supposed to be rendered for the selected blocks. Why in this case, we have multiple toolbars (regardless of interactions)

@youknowriad
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youknowriad commented Jan 23, 2023

I also was not able to reproduce the issue initially by following the instructions here. (I mean without the fix)

@ntsekouras
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This seems to have to do with the Post Excerpt block, when you click in the read more RichText. I'm testing with other blocks that have RichText instance and for now I couldn't reproduce. I'll try to investigate more why this happens in this case.

@t-hamano
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Thanks for the advice.

This seems to have to do with the Post Excerpt block, when you click in the read more RichText.

I was also able to reproduce it. The problem occurs when I click on the 'Add "read more" link text' area in this block.

In addition to this, I have found a very strange point. Changing the display property of the more link text from inline-block to block, as shown below, solves this problem.

diff --git a/packages/block-library/src/post-excerpt/style.scss b/packages/block-library/src/post-excerpt/style.scss
index e7b3e18491..0cb071e25d 100644
--- a/packages/block-library/src/post-excerpt/style.scss
+++ b/packages/block-library/src/post-excerpt/style.scss
@@ -1,3 +1,3 @@
 .wp-block-post-excerpt__more-link {
-       display: inline-block;
+       display: block;
 }

Of course, this problem should not be fixed by this change, but one wonders why it would be fixed by this change 🤔

@ntsekouras
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ntsekouras commented Jan 23, 2023

I found about the display: inline-block issue with pointer-events too, but haven't figured out yet the reason for this. The weird thing is that similar issues seem to suggest that it should also work with inline-block elements. Also we shouldn't fix just a block and something generic should be implemented.

Having said that Riad mentions a different issue:

The other thing is that there might be another issue here causing the duplicate toolbars as toolbars are only supposed to be rendered for the selected blocks. Why in this case, we have multiple toolbars (regardless of interactions)

It doesn't need to be part of this PR of course, but Post Template block uses the same blocks for the post items, that means they share the same clientIds, etc.. This is something we need to investigate better if we can avoid.

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Personally I think it's okay to land this for now, but we need to investigate if we can find a better solution..

Thanks!

@@ -10,6 +10,7 @@
- Move component styles needed for iframes to content styles ([#47103](https://github.com/WordPress/gutenberg/pull/47103)).
- Block Inserter: Correctly apply style to the default inserter ([#47166](https://github.com/WordPress/gutenberg/pull/47166)).
- List View: Fix crash when the first template-parts is deleted width del key ([#47227](https://github.com/WordPress/gutenberg/pull/47227)).
- Block Preview: Try to fix multiple rendering of controls ([#47331](https://github.com/WordPress/gutenberg/pull/47331)).
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Probably change the message here to explain that you disabled the ability select text in the useBlockPreview hook.

@t-hamano t-hamano changed the title Block Preview: Try to fix multiple rendering of controls Disable the ability select text in the useBlockPreview hook Jan 23, 2023
@t-hamano
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@youknowriad
@ntsekouras

Thanks for the review. I would like to merge this PR, but how about leaving #47293 open to explore the root cause?

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useBlockPreview relies on useDisabled to disable interactions within it. If I'm not wrong useDisabled applies the "inert" attribute which also is supposed to disable selection no? so why does it not work by default here?

@t-hamano
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useBlockPreview relies on useDisabled to disable interactions within it. If I'm not wrong useDisabled applies the "inert" attribute which also is supposed to disable selection no? so why does it not work by default here?

From what I've researched, useDisabled() doesn't seem to work properly inside the iframe. As shown below, the inert attribute seems to work well when considering relative document. Does this make sense?

diff --git a/packages/compose/src/hooks/use-disabled/index.ts b/packages/compose/src/hooks/use-disabled/index.ts
index 7a384cbcc5..7d5cf135aa 100644
--- a/packages/compose/src/hooks/use-disabled/index.ts
+++ b/packages/compose/src/hooks/use-disabled/index.ts
@@ -34,16 +34,21 @@ export default function useDisabled( {
        isDisabled: isDisabledProp = false,
 } = {} ) {
        return useRefEffect(
-               ( node ) => {
+               ( node: Node ) => {
                        if ( isDisabledProp ) {
                                return;
                        }
 
+                       const defaultView = node?.ownerDocument?.defaultView;
+                       if ( ! defaultView ) {
+                               return;
+                       }
+
                        /** A variable keeping track of the previous updates in order to restore them. */
                        const updates: Function[] = [];
                        const disable = () => {
                                node.childNodes.forEach( ( child ) => {
-                                       if ( ! ( child instanceof HTMLElement ) ) {
+                                       if ( ! ( child instanceof defaultView.HTMLElement ) ) {
                                                return;
                                        }

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From what I've researched, useDisabled() doesn't seem to work properly inside the iframe. As shown below, the inert attribute seems to work well when considering relative document. Does this make sense?

Not sure I follow, is this because of the polyfill that is not loaded in the iframe or something else? Regardless, if feels we shouldn't hack something in this PR instead we should fix the root issue which is why useDisabled is not working inside the iframe

@t-hamano
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I would like to freeze this PR and try to find the root cause of this problem. If we can get the useDisabled() function to grant the inert attribute as intended, this problem might be solved.

However, as we investigated in #47190, it may not work correctly in FireFox, so we will continue to investigate this issue as well.

@aaronrobertshaw
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I noticed that the original issue only occurs for me when I select the read more link in a post after the first within the Post Template block.

This PR tests well in terms of fixing the issue but I agree that it would be better to ensure useDisabled works as expected within an iframe.

It doesn't need to be part of this PR of course, but Post Template block uses the same blocks for the post items, that means they share the same clientIds, etc.. This is something we need to investigate better if we can avoid.

The ToolsPanel uses the clientId to ensure controls rendered via SlotFills are only rendered when their respective block is selected. If these IDs aren't unique across blocks, that might be part of the issue. For the block inspector sidebar at least.

@t-hamano
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I have submitted #47459 for a more radical solution.

Therefore, I would like to close this PR for the time being. If #47459 does not solve the problem, it may be a good idea to merge this PR as a temporary fix.

@t-hamano t-hamano closed this Jan 26, 2023
@t-hamano t-hamano deleted the fix/post-template-preview-duplicate branch January 26, 2023 15:37
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[Feature] Site Editor Related to the overarching Site Editor (formerly "full site editing") [Type] Bug An existing feature does not function as intended
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Randomly duplicating design tools
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