add a new object in other plate when slicing a plate
it will stop the background slicing process
and it should also send a complete event
Change-Id: Ie7cbcb5a97251a002b7448eb8a9c5bbde1680956
(cherry picked from commit 710a2b273424d59313d7053f0f2c2b54b0c849c0)
Thanks SoftForever for your works to support
sending a gcode file to third-party printer
Change-Id: I3cba43c8bd878f1f1c2fd5fae202ed4d922e8727
Signed-off-by: Stone Li <stone.li@bambulab.com>