The batched-emit fix still lost segments on a large connected drag (peer
dropped the P3-C1 wire). Deeper cause: the SCHEMATIC_LISTENER fires in
pushSchEdit BEFORE RecalculateConnections (sch_commit.cpp ~402 vs ~430), so
every emit was pre-cleanup RAW geometry; the cleanup that follows (merge
collinear wires, drop/split junctions) was never broadcast. The peer rebuilt
the raw edit and ran its own cleanup over a different dirty scope, so the two
peers cleaned up differently and the peer lost segments.
Replace the listener-list emit with a post-settle full-model snapshot DIFF
(snapshotByUuid), flushed via CallAfter once Push (cleanup included) returns —
capturing tab A's final, already-clean geometry. The peer applies that and
re-cleaning already-clean geometry is idempotent, so they converge. The native
listener is now just a change trigger. g_baseline holds the last-broadcast
state; doApply and kicadCollabSnapshot rebaseline so applied/seed items aren't
re-broadcast (echo). Mirrors pl_editor's snapshot-differ; no kicad-fork change.
Verified two-tab, rigorously (real edit: tabA state changed AND tabA===tabB
byte-for-byte): a wire reroute plus U1A/U1B/C2 symbol drags all converge
exactly. eeschema-collab + eeschema-ui suites green.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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