Blender Git Loki

Fix T67873: View Selected in Graph Editor (Only Selected Curve
Keyframes) takes hidden keys into account when calculating zoom

Note that with the 'View Only Selected Curve Keyframes' option enabled,
it is also possible to select [box/circle/lasso] hidden/non-visible
keyframes. Think this should never happen, but that is for a later
commit (along some deduplication of animdata filtering code)

Reviewed By: Severin, Sybren

Maniphest Tasks: T67873

Differential Revision: https://developer.blender.org/D6237