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Stefan Hildebrandt
37152504b4
Recipient chips could already be dragged between the To/Cc/Bcc fields, but a drop always appended and same-field drops were a no-op, so recipients could not be rearranged without deleting and re-adding them. Add positional drag-and-drop: while dragging a chip, an insertion caret shows the gap it would land in (based on which half of the hovered chip the pointer is over, mirrored for RTL); dropping inserts it there. - same-field drop reorders the chip locally (via onChipsChange), using the source index carried in the drag payload (fromIndex) and adjusting for the removal shift; dropping onto its own position is a no-op; - cross-field drop inserts at the drop position: handleMoveChip gained an optional toIndex (omitted = append, e.g. dropping onto a hidden Cc/Bcc button, preserving existing behaviour); - per-chip onDragOver computes the target gap; the container handles the trailing gap (past the last chip / over the input). No new user-facing strings (the caret is purely visual), so no locale changes. Tests (components/email/__tests__/recipient-chip-drag.test.tsx): reorder to end / front, self-drop no-op, cross-field positional insert, and caret visibility. Also add the missing findComposeIdentityId export to the reply-identity mock in the recipient drag/paste suites so <EmailComposer> mounts in compose mode.