Blender Git Loki

Fix T80708: FCurve modifiers change behavior after editing NLA clip

Tag an Action for recalculating animation when it's pushed down onto the
NLA stack, as its effective boundaries change. Normally an Action spans
all of the timeline, and the effects of Cycle modifiers are visible
everywhere. When the Action is converted to an NLA clip, the modifier's
effect should only be visible for the duration of the NLA clip.