49eab72141
This changes the `action.frame_range` Python API to return an accurate frame range for actions. Specifically, it was previously special-cased to return a range with length 1 whenever the length was actually 0. This led to a bizarre situation where a real frame range of `[0.0, 0.2]` would return that range as-is, but a real frame range of `[0.0, 0.0]` would instead return a range of `[0.0, 1.0]`. The new behavior simply always returns the real frame range. The reason for the previous behavior was obscure: the relevant code was also used internally in Blender's NLA system, and returning a zero-length range could result in NLA strips getting infinite scale. The code is now separated out appropriately so that the NLA system still gets the non-zero-length range, while the Python API for actions returns the real range. Pull Request: https://projects.blender.org/blender/blender/pulls/112709
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