## Summary
Stops the Shape submenu (and any other PrimeVue nested submenu) from
being clipped behind the node context menu when the menu fits in the
viewport.
## Changes
- **What**: `constrainMenuHeight` in `NodeContextMenu.vue` now applies
`max-height` + `overflow-y: auto` to the root `<ul>` only when
`scrollHeight > availableHeight`. The common case keeps `overflow:
visible`.
- Added `browser_tests/tests/nodeContextMenuShapeSubmenu.spec.ts`
regression spec.
## Review Focus
Root cause: setting only `overflow-y: auto` on a `<ul>` coerces
`overflow-x` to a non-visible value per CSS spec (`If one of
overflow-x/overflow-y is visible and the other isn't, the visible value
is computed as auto`). PrimeVue `ContextMenuSub` renders submenus
in-tree as a nested `<ul>` with `position: absolute; left: 100%`, so the
implicit horizontal clip hides them entirely.
The pre-existing overflow scenario (#10824 / #10854) is unchanged — when
the menu actually overflows, the clamp still applies and
`nodeContextMenuOverflow.spec.ts` continues to verify scroll. Submenu
clipping in that overflow case is a known limitation, not introduced by
this PR.
Fixes FE-570
## screenshot
### AS IS
<img width="788" height="505" alt="Screenshot 2026-05-07 at 12 43 26 PM"
src="https://github.com/user-attachments/assets/36d34070-0c57-4385-a130-0394f22f282e"
/>
### TO BE
<img width="779" height="627" alt="Screenshot 2026-05-07 at 12 42 44 PM"
src="https://github.com/user-attachments/assets/00956729-763b-4787-822f-209e8ea42331"
/>
┆Issue is synchronized with this [Notion
page](https://www.notion.so/PR-12035-fix-keep-node-context-menu-overflow-visible-when-content-fits-3586d73d365081ad9aaec82f220d401c)
by [Unito](https://www.unito.io)
---------
Co-authored-by: GitHub Action <action@github.com>
3b37488eee