Blender Git Loki

Fix T81380: Playback set start/endframe operators can set negative
rendering range

The Allow Negative Frames option, introduced in rB21a2350248fd, allows
for negative frames, but this should only apply for playback and
animations, the rendering range should still be clamped to MINFRAME /
MAXFRAME, because rendering does not allow for negative frames. Preview
range should not be affected afaict (I am not aware of operators that
allow for rendering this range).

Maniphest Tasks: T81380

Differential Revision: https://developer.blender.org/D9112