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Bug: the edit page's remove button (on a current relation) was a plain boosted
form — POST /unrelate -> 303 redirect -> the engine re-rendered #content, and the
freshly-swapped relate picker came back EMPTY ("the list of posts to relate" was
cleared).
Fix: make the remove button an AJAX in-place delete, exactly like the relate
candidate rows — each current-relation <li> gets an id and its form carries
sx-post + sx-target=#cur-<kind>-<other> + sx-swap=delete. unrelate-submit returns
an empty 200 for that request so the engine deletes just that one row; #content is
never re-rendered, so the picker is untouched. method+action stay for no-JS.
The empty-200 is gated on the SX-Target header (sent only by the sx-post form), so
a plain boosted form / no-JS POST still redirects + re-renders — the is-a-tag
toggle and graceful degradation are unaffected.
Tests (all red before the fix):
- lib/host/playwright/relate-picker.spec.js: the remove-button test now asserts
the picker still has candidates after a removal (the reproduction).
- web/tests/test-relate-picker.sx: an SX engine test — removing a current relation
deletes just that row and leaves the sibling picker's list intact.
- lib/host/tests/blog.sx: the relation-editor renders the AJAX delete attrs;
unrelate returns empty-200 with SX-Target and 303 without.
Verified: host conformance 275/275, web engine suite 8/8, run-picker-check 2/2.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>