Blender Git Loki

Fix T87160: DSE Keyframe Selection Now Selects Channels

Select All/Box/Circle/Lasso/MouseClick of keyframes now add channels to selection if any keydata was added to the selection.

Changed box/region select to sync channel selection instead of only ever adding channel to selection. Seems more intuitive

make tmp comments obvious (prefixed //)

Differential Revision: https://developer.blender.org/D11317