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Fix: ActionMenu with overflow doesn’t contain scrollbars within its rounded border #6978

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Fix: ActionMenu with overflow doesn’t contain scrollbars within its rounded border #6978

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0aab81d
It kinda fixes it
pksjce Oct 10, 2025
5855566
Create serious-schools-hope.md
pksjce Oct 10, 2025
34cc3b9
Merge branch 'main' into pk/actionmenu-scrollbars
pksjce Oct 11, 2025
f28fad1
style(ActionMenu): add spacing between max-height variants
pksjce Oct 13, 2025
c81f4b4
Merge branch 'main' into pk/actionmenu-scrollbars
pksjce Oct 14, 2025
4452cb7
Fix ActionMenu overflow scrollbars appearance
pksjce Oct 14, 2025
38caacc
Merge branch 'main' into pk/actionmenu-scrollbars
pksjce Oct 14, 2025
1c845f8
Merge branch 'main' into pk/actionmenu-scrollbars
pksjce Oct 15, 2025
1edbe60
Merge branch 'main' into pk/actionmenu-scrollbars
pksjce Oct 16, 2025
5769bb8
Merge branch 'main' into pk/actionmenu-scrollbars
pksjce Oct 17, 2025
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5 changes: 5 additions & 0 deletions .changeset/serious-schools-hope.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
"@primer/react": patch
---

Fix: ActionMenu with overflow contains scrollbars within its rounded border
42 changes: 42 additions & 0 deletions packages/react/src/ActionMenu/ActionMenu.module.css
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Original file line number Diff line number Diff line change
Expand Up @@ -2,4 +2,46 @@
&:where([data-variant='fullscreen']) {
padding-top: var(--base-size-36);
}

/* Overflow variants */
&:where([data-overflow-auto]) {
overflow: auto;
}

&:where([data-overflow-hidden]) {
overflow: hidden;
}

&:where([data-overflow-scroll]) {
overflow: scroll;
}

&:where([data-overflow-visible]) {
overflow: visible;
}

/* Max-height size tokens (mirror Overlay sizes) */
&:where([data-max-height-xsmall]) {
max-height: 192px;
}

&:where([data-max-height-small]) {
max-height: 256px;
}

&:where([data-max-height-medium]) {
max-height: 320px;
}

&:where([data-max-height-large]) {
max-height: 432px;
}

&:where([data-max-height-xlarge]) {
max-height: 600px;
Comment on lines +25 to +41
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Copilot AI Oct 14, 2025

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The hardcoded pixel values for max-height create potential inconsistency with the design system. Consider using CSS custom properties or design tokens to ensure these values stay synchronized with the Overlay component's sizing system that this is mirroring.

Suggested change
max-height: 192px;
}
&:where([data-max-height-small]) {
max-height: 256px;
}
&:where([data-max-height-medium]) {
max-height: 320px;
}
&:where([data-max-height-large]) {
max-height: 432px;
}
&:where([data-max-height-xlarge]) {
max-height: 600px;
max-height: var(--overlay-size-xsmall, 192px);
}
&:where([data-max-height-small]) {
max-height: var(--overlay-size-small, 256px);
}
&:where([data-max-height-medium]) {
max-height: var(--overlay-size-medium, 320px);
}
&:where([data-max-height-large]) {
max-height: var(--overlay-size-large, 432px);
}
&:where([data-max-height-xlarge]) {
max-height: var(--overlay-size-xlarge, 600px);

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Good suggestion!

}

&:where([data-max-height-fit-content]) {
max-height: fit-content;
}
}
8 changes: 7 additions & 1 deletion packages/react/src/ActionMenu/ActionMenu.tsx
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Expand Up @@ -316,7 +316,13 @@ const Overlay: FCWithSlotMarker<React.PropsWithChildren<MenuOverlayProps>> = ({
onPositionChange={onPositionChange}
variant={variant}
>
<div ref={containerRef} className={styles.ActionMenuContainer} data-variant={responsiveVariant}>
<div
ref={containerRef}
className={styles.ActionMenuContainer}
data-variant={responsiveVariant}
{...(overlayProps.overflow ? {[`data-overflow-${overlayProps.overflow}`]: ''} : {})}
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Do we want a default value or not?

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not sure :( Don't want to add unnecessary hidden. I just want it to reflect its parent.

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Valid, what's the default right now? Maybe we should keep that (is it auto?)

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It came with no value(maybe default is visible from docs). And I add it only if parent has some value.

{...(overlayProps.maxHeight ? {[`data-max-height-${overlayProps.maxHeight}`]: ''} : {})}
Comment on lines +323 to +324
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Copilot AI Oct 14, 2025

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The dynamic data attribute generation using template literals could be error-prone if overlayProps contains unexpected values. Consider validating the overflow and maxHeight values against known valid options or using a mapping function to ensure only supported values are used.

Suggested change
{...(overlayProps.overflow ? {[`data-overflow-${overlayProps.overflow}`]: ''} : {})}
{...(overlayProps.maxHeight ? {[`data-max-height-${overlayProps.maxHeight}`]: ''} : {})}
{
(() => {
const allowedOverflows = ['auto', 'visible', 'hidden', 'scroll'];
const allowedMaxHeights = ['small', 'medium', 'large'];
const overflow = overlayProps.overflow;
const maxHeight = overlayProps.maxHeight;
const attrs: {[key: string]: string} = {};
if (overflow && allowedOverflows.includes(overflow)) {
attrs[`data-overflow-${overflow}`] = '';
}
if (maxHeight && allowedMaxHeights.includes(maxHeight)) {
attrs[`data-max-height-${maxHeight}`] = '';
}
return attrs;
})()
}

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>
<ActionListContainerContext.Provider
value={{
container: 'ActionMenu',
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