[prath47]

Fixes #27818

CdkMenuItemSelectable sets closeOnSpacebarTrigger = false so checkbox/radio items keep the menu open when toggled with Space. That only kicks in on the keydown path, though. For a native <button> (which is what the docs examples use), _onKeydown skips Space/Enter because eventDispatchesNativeClick says the browser will dispatch a click. That click then goes through _handleClick → trigger() with no keepOpen, so the menu closes anyway.

The keydown handler now stores whether that key should keep the menu open before letting the native click through, and _handleClick uses it for the click that follows. I only honour it for clicks with detail === 0 (what the browser dispatches for keyboard activation), so a stale flag can't make a later mouse click keep the menu open. The flag is reset after every click.

Nothing changes for non-native items (they never got the native click and already used keepOpen), for Enter, or for mouse clicks.

Tests

Unit tests can't produce a trusted keydown, so the new specs call _onKeydown with a trusted-looking event and then dispatch a detail: 0 click, the same sequence the browser produces:

• checkbox: Space keeps the menu open, Enter closes it, and a mouse click after a Space keydown still closes it
• radio: Space keeps the menu open

bazel test //src/cdk/menu:unit_tests

//src/cdk/menu:unit_tests_chromium      PASSED
//src/cdk/menu:unit_tests_firefox       PASSED

Without the menu-item.ts change, both Space specs fail with Expected spy closeAll not to have been called.

Manual check

I also checked with real key presses through Playwright, using a cdkMenuTriggerFor menu with <button cdkMenuItemCheckbox> / <button cdkMenuItemRadio> items like the docs example (CDK 22.2.6, then the same build with this change). Steps: open the menu with Enter, ArrowDown to "Italic", press Space.

	before	after
Chromium 156	menu closed, focus back on trigger	menu open, focus on Italic
Firefox 157	menu closed	menu open
WebKit 27.2	menu closed	menu open

In all three, Italic gets toggled either way. With the change, Enter on an item and a mouse click on an item still close the menu.

Before:

After: