1.new: forbidden add multicolor from preview slider if a plate uses multiple filaments in prepare
2.fix: cannot change color from preview slider if a plate uses different color with another plate.
Change-Id: I28dee0e158fab121dc888590c4cc7554900504be
1. Alt is no long for object/part delection
2. Alt is defined to select part in View3D
Signed-off-by: yifan.wu <yifan.wu@bambulab.com>
Change-Id: If0f14f79a321be2d0320a841e15dc973715364ea
(cherry picked from commit 9c092f2d20b89470202df037180425b2ecb8ef82)
liz.li
tao.jin
xiangdong.yang
yifan.wu
lane.wei