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Dropdown: remove extra white space around toggle #56005

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merged 2 commits into from
Nov 9, 2023

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ciampo
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@ciampo ciampo commented Nov 9, 2023

What?

A tweak to the Dropdown component to make sure that there isn't extra white space rendered around the toggle button.

Why?

As flagged in #56002 (comment), sometimes there could be extra space around the dropdown toggle

How?

By changing Dropdown's display style from inline-block to inline-flex. Using flexbox, in fact, automatically removes such white space around a wrapper's children.

Testing Instructions

  • In the DropdownMenu example, add toggleProps: { size: 'small' } prop to the default example
  • Make sure that the DropdownMenu wrapper element around the toggle (the one with class components-dropdown components-dropdown-menu) is exactly 24x24 px (with the same changes applied to trunk, the wrapper would be 27px tall instead of 24)

Additionally, smoke test usages of Dropdown and DropdownMenu across the editor and make sure that the components look and behave as expected.

@ciampo ciampo added [Type] Bug An existing feature does not function as intended [Package] Components /packages/components labels Nov 9, 2023
@ciampo ciampo requested review from jameskoster and a team November 9, 2023 16:29
@ciampo ciampo self-assigned this Nov 9, 2023
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github-actions bot commented Nov 9, 2023

Size Change: -4 B (0%)

Total Size: 1.7 MB

Filename Size Change
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build/components/style.css 12 kB -3 B (0%)
ℹ️ View Unchanged
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@jameskoster jameskoster left a comment

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Thanks, it works well. I didn't spot any issues in the Editor.

@ciampo ciampo enabled auto-merge (squash) November 9, 2023 20:58
@ciampo ciampo merged commit 8e9b4c0 into trunk Nov 9, 2023
51 checks passed
@ciampo ciampo deleted the fix/dropdown-menu-toggle-spacing branch November 9, 2023 21:13
@github-actions github-actions bot added this to the Gutenberg 17.1 milestone Nov 9, 2023
@andrewserong
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It looks like this change has caused a regression for the color picker buttons:

image

With inline-block:

image

I imagine we could fix this locally for the color selection buttons, but I imagine there could be other components out in the wild that expected the inline-block layout instead. Would it be worth reverting?

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ciampo commented Nov 10, 2023

Let's revert for now, and think about a more satisfactory solution.

In theory, switching to a flex-based layout is the correct solution for dealing with inline-block extra spacing. An even better solution would be to use the white-space-collapse CSS property, but, unfortunately, it is very immature and not implemented across browsers.

A couple of ideas that we would need to test:

  • we could add .components-dropdown > * { flex-grow: 1; } (although I'm not sure if this would have other unintended consequences)
  • we could keep display: inline-block and add line-height: 0 to remove the extra white space

All of these solutions could potentially cause some changes in the consumers of Drodpown and DropdownMenu.

Another simpler alternative could be to add something like vertical-align: top; to the toggle where possible (ie., in DropdownMenu), and otherwise expect the users of Dropdown to apply similar styles themselves to tweak the white spacing.

@andrewserong @jameskoster what are your thoughts? The more I think about it, the more I believe that the last option (vertical-align) may be the safest.

ciampo added a commit that referenced this pull request Nov 10, 2023
@andrewserong
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Thanks for reverting, and for the follow-up!

Interesting problem. I think option 1 sounds potentially risky since we don't know what the children will be doing exactly, and similarly applying line-height: 0 could potentially be unexpected if someone has content that's expected to wrap.

vertical-align: top applied on the toggle appears to work well for me locally. I reckon that sounds like the safest to me!

cbravobernal pushed a commit that referenced this pull request Nov 14, 2023
* Dropdown: remove extra white space around toggle

* CHANGELOG
@t-hamano
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I discovered the following problem, probably related to this PR and #56028. In the Site Editor sidebar, the button with the dropdown is shifted to the bottom.

As @andrewserong said, the problem can be solved by applying vertical-align:top to this part. Also, it seems that this problem can be resolved by returning to display: inline-flex again.

issue

@andrewserong
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Thanks for flagging that @t-hamano — interestingly enough, that button in the Navigation header goes back to displaying in the correct position if we remove the vertical-align: top rule in the dropdown toggle introduced in #56136:

image

Another option could be to set the wrapper for the actions in the navigation screen header to display: flex. I think that might be preferable so that the items in that particular area don't have to worry about their alignment. It's possible we might run into similar situations with other components, though!

I've opened a PR in #56233 to fix the positioning in case we want to go in that direction for that component 🙂

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4 participants