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Reporter on Bambu Studio 2.7.1.57 + X1C saw the Send modal stuck at
"Downloading" after sending to a Queue-mode VP. Delete-from-queue and
even Auto-Dispatch ON + a successful real print didn't release it.
Root cause: BS 2.7.x flipped the Send sequence from
MQTT project_file -> FTP upload -> done
to
FTP verify_job -> FTP .3mf -> MQTT project_file.
The #1280 fix sets gcode_state=FINISH in on_file_received (after the
FTP upload). Under the new order, the synthetic project_file ack in
_send_print_response then runs and overwrites _gcode_state back to
PREPARE. The 1 Hz cached-as-base push stream carries PREPARE forever,
the slicer never sees the FINISH transition it waits for, and the
modal sits stuck. Auto-Dispatch ON shares the cause: the real
printer's PREPARE->RUNNING->FINISH on the bridge gets masked by the
local _gcode_state override in _send_status_report.
Re-fire set_gcode_state("FINISH", filename, prepare_percent="100")
1.5 s after the project_file ack for every non-proxy mode (queue /
archive / review). The 1.5 s window lets the slicer see at least one
PREPARE push on the 1 Hz cycle so the transition reads as
PREPARE -> FINISH, matching what the slicer expects. Proxy mode is
exempt -- there the real printer drives the bridge state and a
synthetic FINISH would clobber a real PREPARE/RUNNING transition.
The scheduler cancels any in-flight timer when a new project_file
arrives so a retrying slicer doesn't end with two competing FINISH
timers. The pending timer is also cancelled on stop_server.