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Fix broken undo history stack for Pattern Overrides #57088

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merged 4 commits into from
Dec 22, 2023

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@kevin940726 kevin940726 commented Dec 15, 2023

What?

The undo history is a bit broken for Pattern Overrides. This PR tries to fix it.

Why?

For better editing experience.

How?

This PR removes the syncDerivedBlockAttributes action introduced in the original PR (#56235) an instead introduce a new private higher-order action syncDerivedUpdates.

The signature of syncDerivedUpdates looks like:

syncDerivedUpdates( callback: () => void ): void;

Any updates inside the callback should not push additional undo history stacks nor should be persistent. This serves as a escape hatch to make updates to the block editor completely invisible to the core's undo manager. This means we can call setAttributes to set the overrides of the pattern block without worrying that it might break the history stack.

Example usage:

const { syncDerivedUpdates } = unlock( registry.dispatch( blockEditorStore ) );

syncDerivedUpdates( () => {
  setAttributes({ overrides });
} );

The goal is to make something like this stable enough so that third-party developers can leverage it too. We probably can use it solve some of the longstanding undo bugs too (#8119 (comment), #41031 (comment)).

Note

This API currently doesn't work 100% of the time for other blocks so it should remain private for now. The top priority of this PR is to fix the existing issue for Pattern Overrides. We can work on finalizing the API across different use cases in the future.

Testing Instructions

  1. Enable the "Partial syncing patterns gutenberg experiment.
  2. Go to Site Editor -> Patterns -> Create a synced pattern.
  3. Add a paragraph and go to the block inspector sidebar -> Advanced -> Check the "Synced attributes" checkbox.
  4. Save the pattern.
  5. Go to edit a post.
  6. Insert the pattern.
  7. Make some changes to the enabled paragraph and test the undo history.

Screenshots or screencast

Kapture.2023-12-19.at.14.22.05.mp4

@kevin940726 kevin940726 added [Feature] Synced Patterns Related to synced patterns (formerly reusable blocks) [Feature] History History, undo, redo, revisions, autosave. [Block] Block The "Reusable Block" Block [Type] Experimental Experimental feature or API. [Feature] Patterns A collection of blocks that can be synced (previously reusable blocks) or unsynced labels Dec 15, 2023
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github-actions bot commented Dec 15, 2023

Size Change: +171 B (0%)

Total Size: 1.71 MB

Filename Size Change
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build/block-library/index.min.js 214 kB +18 B (0%)
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ℹ️ View Unchanged
Filename Size
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github-actions bot commented Dec 15, 2023

Flaky tests detected in f5c1a78.
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/7296946839
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@kevin940726 kevin940726 marked this pull request as draft December 18, 2023 01:50
@kevin940726 kevin940726 force-pushed the fix/pattern-overrides-undo-history branch from 8d94ddf to 703f0a7 Compare December 19, 2023 06:17
@kevin940726 kevin940726 self-assigned this Dec 19, 2023
@kevin940726 kevin940726 marked this pull request as ready for review December 19, 2023 06:23
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@Mamaduka Mamaduka left a comment

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Briefly tested and read through the code. I think this is an interesting idea.

Will try to do more thorough testing later this week.

P.S. Tried to use the state.blocks.isPersistentChange flag when working on a fix for the ToC block, but I couldn't get it working 😅

Comment on lines +320 to +322
// Ignore pushing undo stack for the updated blocks.
const updatedBlocks = select.getBlocks();
undoIgnoreBlocks.add( updatedBlocks );
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@Mamaduka Mamaduka Dec 19, 2023

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It would be nice to be more explicit here and store only updated blocks instead of every block. Probably something for the future and before API is stable.

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It's storing the updated blocks reference in a WeakSet so it shouldn't create extra memory nor leak it. In a way it's actually faster to not do any transformation here 😆. We can probably achieve the same thing with a flag in the store, like what isPersistentChange does, but the higher-order reducer makes it unnecessarily hard 😅. We can revisit this part in a future API design.

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Thanks for testing it out! ❤️

Tried to use the state.blocks.isPersistentChange flag when working on a fix for the ToC block, but I couldn't get it working 😅

I tried using syncDerivedUpdates in the ToC block but seems like the subscribe function messes things up a bit so it currently doesn't work (hence the note in the PR description). Namely, the timing of calling registry.subscribe globally (without the second argument) behaves differently from only subscribing to a single store. We can look into that in the future. 🤔

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@glendaviesnz glendaviesnz left a comment

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This tested well for me. Without this there was an additional step in the undo history for pattern overrides, but with the PR the stack has the expected number of entries.

Although as noted this doesn't yet work with all blocks, given that its usage is currently limited to the new pattern block behind an experimental flag I think it is safe to merge and iterate.

@kevin940726 kevin940726 force-pushed the fix/pattern-overrides-undo-history branch from 569b503 to f5c1a78 Compare December 22, 2023 06:25
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I'll merge this and we can iterate on the API design in the future. It's currently still private anyway. Thanks for the reviews!

@kevin940726 kevin940726 merged commit 0080b75 into trunk Dec 22, 2023
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@kevin940726 kevin940726 deleted the fix/pattern-overrides-undo-history branch December 22, 2023 09:07
@github-actions github-actions bot added this to the Gutenberg 17.4 milestone Dec 22, 2023
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[Block] Block The "Reusable Block" Block [Feature] History History, undo, redo, revisions, autosave. [Feature] Patterns A collection of blocks that can be synced (previously reusable blocks) or unsynced [Feature] Synced Patterns Related to synced patterns (formerly reusable blocks) [Type] Experimental Experimental feature or API.
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3 participants