DopeSheet Group Select => Bone Select Tweak: Don't change selection status of
bones if "Only Selected" dopesheet filter is enabled.

When this was enabled, it would be too easy to accidentally change the selected
bones, causing the keyframes you were just editing to disappear


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk@60892 954f8c5b-7b00-dc11-b283-0030488c597c