Thomas Trompette b682162f31 fix(front): render +N button for right-edge-clipped chips in expandable list (#22748)
## Problem

Fixes #22383. Overflowing relation & multi-select chip cells didn't show
the "+N" overflow button, so hidden records/values were unreachable.
There were several distinct causes behind this, addressed below.

Before
<img width="263" height="34" alt="Capture d’écran 2026-07-10 à 11 43
13"
src="https://github.com/user-attachments/assets/1001d47b-0f54-4fbd-a5cb-83a5c32c35ac"
/>

After
<img width="263" height="34" alt="Capture d’écran 2026-07-10 à 11 41
54"
src="https://github.com/user-attachments/assets/d4f5cf2f-fda4-422e-b72d-2df3fc81a06f"
/>

## Changes

**1. Overflow detection missed right-edge-clipped chips**
`isFirstOverflowingChildElement` used `childElement.offsetLeft >
containerElement.clientWidth` (left edge past the container), which is
false when a chip is only right-edge clipped. Switched to a right-edge
check: `childElement.offsetLeft + childElement.offsetWidth >
containerElement.clientWidth`.

**2. Multi-select never used the overflow list when unfocused**
`MultiSelectFieldDisplay` rendered a plain clipped `MultiSelectDisplay`
when not focused, and only used `ExpandableList` on focus. That
non-focused fallback painted over the focused "+N" and hid it. It now
always renders through `ExpandableList` with
`isChipCountDisplayed={isFocused}`, matching
`RelationFromManyFieldDisplay`, so the count shows on focus only (not
idle).

**3. The hover portal was never actually focused**
`FieldFocusContextProvider` silently ignored its `isFocused` prop (`({
children }: any)` + hard-coded `useState(false)`), so
`RecordInlineCellAnchoredPortal`'s `<FieldFocusContextProvider
isFocused={true}>` had no effect and the hovered cell's display always
saw `isFocused=false`. That's why "+N" never appeared on hover for any
multi-value field. The portal now uses the existing
`FieldFocusStaticFocusedProvider`, fulfilling the intent — so relations,
multi-select, emails and phones all surface their "+N" on hover.

**4. "+N" was hard to read on multi-select**
The "+N" chip has a transparent background (shared component), and the
hover portal let the base layer's colored option chips bleed through it.
Gave the hover portal content an opaque `background.primary` so nothing
bleeds through; the "+N" component itself is untouched, so
relations/emails/phones keep their existing look.

## Test plan

- Hover a relation or multi-select field whose values overflow the cell:
the "+N" button appears (and is readable), and clicking it lists the
hidden records. When not hovered, no "+N" shows.
- Verify fully-overflowing rows still show the correct "+N" count.
2026-07-10 13:22:03 +02:00
2026-06-11 11:02:28 +02:00

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