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Query block: Fix full width children from scrolling horizontally only in the editor #32892

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merged 3 commits into from
Jun 23, 2021

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MaggieCabrera
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@MaggieCabrera MaggieCabrera commented Jun 22, 2021

Description

After #30141 was merged, the box-sizing inherit rules for ul and ol are no longer setting them to border-box as they should. This causes the layout to break in the editor if a full width query block with full width children inside when they have horizontal padding inside, causing horizontal scroll. I am hesitating as to where this should be fixed and I'm leaning towards this block fix, but maybe this should be better handled elsewhere.

How has this been tested?

On emptytheme, paste this query loop on a page. Alternatively: create any query loop that is full width and has inside it another block that is full width and has horizontal padding, such as a cover or group block.

The editor will have horizontal scroll while the frontend shows up fine.

Screenshots

Before After
Screenshot 2021-06-22 at 15 34 06 Screenshot 2021-06-22 at 15 33 47

Types of changes

Bug fix (non-breaking change which fixes an issue)

Checklist:

  • My code is tested.
  • My code follows the WordPress code style.
  • My code follows the accessibility standards.
  • I've tested my changes with keyboard and screen readers.
  • My code has proper inline documentation.
  • I've included developer documentation if appropriate.
  • I've updated all React Native files affected by any refactorings/renamings in this PR (please manually search all *.native.js files for terms that need renaming or removal).

@MaggieCabrera MaggieCabrera requested a review from ajitbohra as a code owner June 22, 2021 13:39
@MaggieCabrera MaggieCabrera added the [Block] Query Loop Affects the Query Loop Block label Jun 22, 2021
@MaggieCabrera MaggieCabrera self-assigned this Jun 22, 2021
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Size Change: +71 B (0%)

Total Size: 1.04 MB

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Two questions here:

  • Why is this only happening in the editor and not the frontend?
  • It seems the ul, ol we're targeting here is the Post Template block's one right? so why add this bit of CSS to the Query block instead?

@MaggieCabrera
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Two questions here:

* Why is this only happening in the editor and not the frontend?

Yes, the frontend doesn't have that ul, ol { box-sizing: revert; } that the editor has. revert is resolving to content-box instead of border-box in the editor while in the frontend it's inheriting the border-box from the cover/group block css.

* It seems the ul, ol we're targeting here is the `Post Template` block's one right? so why add this bit of CSS to the `Query` block instead?

yeah you are right, I can totally do that

@MaggieCabrera
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It's this line that's breaking things in this particular case.

@youknowriad
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it's inheriting the border-box from the cover/group block css

Do you know which CSS is that?

@MaggieCabrera
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So this is what's happening:

On the frontend we don't have this or this, we only have the block style adding border-box to the cover and it works as expected.

On the editor however, the .edit-post-visual-editor * rule from the reset mixin is more specific than the cover block styles, effectively changing the box-sizing to inherit. And since the ul from the query loop is the closest parent that has a box-sizing defined (set to revert by the editor's reset) it ends up resolved to content-box instead. Hope that was clearer? this one had me doing some detective work to find out what was going on.

@youknowriad
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Hope that was clearer? this one had me doing some detective work to find out what was going on.

So the issue is in fact in the cover block right? not the post-template? Isn't the right fix here to add box-sizing: border-box to the cover block instead? (Sorry for my questions, just trying to figure out if we're doing the right fix :) )

@MaggieCabrera
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So the issue is in fact in the cover block right? not the post-template? Isn't the right fix here to add box-sizing: border-box to the cover block instead? (Sorry for my questions, just trying to figure out if we're doing the right fix :) )

I totally understand, it's kind of a tricky one! the cover block already has that rule (here) but it's losing the specificity war to this:

Screenshot 2021-06-23 at 12 33 40

@youknowriad
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Ok that's clearer now :) I think the ideal fix (which would solve more issues later :P) is to actually apply the same "wrapping" behavior we have for the reset and theme styles to the block library styles. (there's an issue for it somewhere) But obviously, that fix is bigger and more tricky.

So I think it's fine to do something like the proposal in this PR in the meantime. One thing I'm wondering though is if it's an issue that is specific to Query block or if it needs to be solved differently. I mean the issue would surface if we insert a Cover inside any other container block that would use the reset rule, isn't it?

So do you think maybe a better fix would be to actually add the following css to the editor.css of the cover block instead?

/* Extra specificity needed because the reset.css applied in the editor context is overriding this rule. */
.editor-styles-wrapper .wp-block-cover {
  box-sizing: border-box;
}

@MaggieCabrera
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I was wondering myself what's the best way to solve this because the "inherit" value that is more specific now is only an issue because of the ul/ol rule that exists that is setting it to "revert". So this is only failing whenever one of this blocks is inside of a list, not just the query block (but I don't know where or if that even happens, but ofc if it doesn't it totally could in the future). It's also the reason why the cover block is perfectly fine when outside the query block.

I tried your solution and it solves the specificity issue. Now I'm thinking that we should do this for any other block that can have paddings, such as a group block but I just tried that on my test env and the problem is not happening, so I'm going to debug further.

@MaggieCabrera
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Ok, I just applied the fix to the cover block and I think it should be fine for now, unless you can think of any other blocks that could be affected by this.

The group block would need this fix too if it were to have a width value applied to it. By its nature it doesn't have it so right now it's working as intended (though the box-sizing value for it is also content-box right now in the same context that is for the cover block)

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@youknowriad youknowriad left a comment

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LGTM 👍

We should explore separately, applying the same "wrapping" behavior to the block library stylesheet to have the same relative specificity between stylesheets that we have in the frontend.

@MaggieCabrera MaggieCabrera added [Block] Cover Affects the Cover Block - used to display content laid over a background image and removed [Block] Query Loop Affects the Query Loop Block labels Jun 23, 2021
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@aristath aristath left a comment

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🎉

@MaggieCabrera MaggieCabrera force-pushed the fix-query-block-nested-full-width branch from 01aeb0e to b701ce2 Compare June 23, 2021 15:28
@youknowriad youknowriad merged commit e308fbb into trunk Jun 23, 2021
@youknowriad youknowriad deleted the fix-query-block-nested-full-width branch June 23, 2021 16:00
@github-actions github-actions bot added this to the Gutenberg 11.0 milestone Jun 23, 2021
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3 participants