fix(dropzone): address PR review feedback for event handlers by Copilot · Pull Request #4919 · mui/base-ui

Copilot · 2026-05-26T21:56:58Z

Addresses unresolved review comments from the Dropzone PR regarding event handler edge cases.

Changes

Short-circuit handleDragEnter when already dragging — Prevents repeated onDraggingChange(true) calls and redundant screen reader announcements when dragenter bubbles from descendants
Guard handleKeyDown for nested elements — Checks event.target !== event.currentTarget to prevent Enter/Space on nested buttons from triggering the file picker, mirroring the click handler behavior
Restore test spy — Wrap HTMLInputElement.prototype.click spy in try/finally with mockRestore() to prevent leakage
Fix accessibility test selectors — Update tests to find status region via parentElement.querySelector since it's now a sibling
Add keyboard test coverage — New test verifying nested element keyboard activation doesn't trigger file picker

Example

// Before: pressing Enter on nested button would open file picker
<Dropzone.Root>
  <button>Edit settings</button>  {/* Enter here incorrectly triggers picker */}
</Dropzone.Root>

// After: nested interactive elements work independently
<Dropzone.Root>
  <button>Edit settings</button>  {/* Enter works as expected */}
</Dropzone.Root>

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

- Remove stale dropzone-input.json (leftover from Input → HiddenInput rename) - Clarify onOpen JSDoc: only fires when no HiddenInput is present - CSS modules demo: replace hardcoded hex colors with design tokens, wrap hover in @media (hover: hover), fix :focus → :focus-visible, remove redundant .input class (HiddenInput handles its own visibility) - Tailwind demo: fix focus: → focus-visible: variants - public-types: fix Dropzone.Props/State → Dropzone.Root.Props/State - Update generated types.md for onOpen description change Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

- Add './dropzone' to packages/react/package.json exports so @base-ui/react/dropzone resolves correctly - Fix non-breaking space in 'Base UI' brand name in dropzone/page.mdx and components/page.mdx (vale MuiBrandName rule) Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Use 'Base\u00a0UI' as a standalone keyword to match the convention of all other components, so docs:validate generates the correct non-breaking space in the component index (vale MuiBrandName rule). Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

- CSS modules demo: replace undefined --color-gray-* vars with direct oklch() values; set explicit color on container to prevent currentColor from inheriting red from the docs demo sentinel - Tailwind demo: replace gray-* with neutral-* (the project's defined color tokens) and blue-600/50/100 with available blue-500/blue-500/10 blue-500/15 tokens; add text-neutral-900 to the container for correct currentColor baseline Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

…sions CSS module <p> elements inherit UA default margins and line-heights because all: revert-layer removes Tailwind preflight. Add explicit margin: 0 and line-height to match Tailwind's preflight behaviour. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

- Use 'Whether the component should ignore user interaction.' for disabled - Use 'Event handler called when...' for event handler props - Add docs link and 'Renders a <X> element.' to component JSDoc - Simplify children description to match Dialog/Collapsible patterns - Regenerate types.md Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

The dragging state is driven purely by browser drag events — there's no meaningful external trigger to set it programmatically. onDraggingChange is sufficient for observing the state. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> Signed-off-by: Matt <github@nospam.33m.co>

…e-comments-in-review-thread

netlify · 2026-05-26T21:59:43Z

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code-infra-dashboard · 2026-05-26T22:00:28Z

Bundle size

Bundle	Parsed size	Gzip size
@base-ui/react	🔺+2.26KB^(+0.49%)	🔺+700B^(+0.47%)

Details of bundle changes

Performance

Total duration: 1,064.70 ms ▼-446.94 ms^(-29.6%) | Renders: 50 ⁽⁺⁰⁾ | Paint: 1,633.83 ms ▼-631.28 ms^(-27.9%)

Test	Duration	Renders
Tabs mount (200 instances)	209.83 ms ▼-83.20 ms^(-28.4%)	4 ⁽⁺⁰⁾
Slider mount (300 instances)	148.38 ms ▼-63.86 ms^(-30.1%)	3 ⁽⁺⁰⁾
Menu mount (300 instances)	119.22 ms ▼-53.77 ms^(-31.1%)	2 ⁽⁺⁰⁾
Select mount (200 instances)	125.70 ms ▼-49.35 ms^(-28.2%)	3 ⁽⁺⁰⁾
Checkbox mount (500 instances)	57.65 ms ▼-41.87 ms^(-42.1%)	1 ⁽⁺⁰⁾

…and 5 more (+2 within noise) — details

Check out the code infra dashboard for more information about this PR.

- Short-circuit handleDragEnter when already dragging to prevent repeated onDraggingChange calls and screen reader announcements - Guard handleKeyDown against events from nested interactive elements to match click handler behavior - Restore HTMLInputElement.prototype.click spy after test to prevent leak - Update accessibility tests to find status region as sibling element

netlify · 2026-05-26T22:02:40Z

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netlify · 2026-05-26T22:04:24Z

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Adds test to verify pressing Enter/Space on a nested button doesn't trigger the file picker

mbrookes · 2026-05-27T06:10:56Z

Closing because Copilot targeted master again, despite an explicit request not to.

mbrookes and others added 14 commits May 25, 2026 21:51

[dropzone] Add new dropzone component

3ef3e29

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

[dropzone] error-codes.json

aef330a

[dropzone] Add to root index exports

230bf87

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Potential fix for pull request finding

29f971f

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> Signed-off-by: Matt <github@nospam.33m.co>

Potential fix for pull request finding

b17d1a6

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> Signed-off-by: Matt <github@nospam.33m.co>

Apply suggestions from code review

add81ae

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> Signed-off-by: Matt <github@nospam.33m.co>

Initial plan

92ad66f

Copilot AI assigned Copilot and mbrookes May 26, 2026

Copilot started work on behalf of mbrookes May 26, 2026 21:57 View session

mbrookes and others added 2 commits May 26, 2026 22:58

Merge branch 'master' into dropzone

344fa3a

Merge remote-tracking branch 'mbrookes/dropzone' into copilot/fix-cod…

b481f24

…e-comments-in-review-thread

test(dropzone): add keyboard activation test for nested elements

c650a14

Adds test to verify pressing Enter/Space on a nested button doesn't trigger the file picker

Copilot AI changed the title ~~[WIP] Fix code based on review comments~~ fix(dropzone): address PR review feedback for event handlers May 26, 2026

Copilot finished work on behalf of mbrookes May 26, 2026 22:05

Copilot AI requested a review from mbrookes May 26, 2026 22:05

mbrookes closed this May 27, 2026

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fix(dropzone): address PR review feedback for event handlers#4919

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