bd00324c26
Change the behavior of the "Frame start" and [Frame] "End" fields of an
NLA Strip in the NLA editor.
Frame Start now behaves like translating with {key G} and moving the
mouse. It also updates the Frame End to ensure the strip remains the
same length.
Frame End changes the length of the strip, based on the Repeat property.
If there are no repeats (i.e. number of repeats = 1) the underlying
Action will change length, such that more or less of its keyframes will
be part of the NLA strip. If there are repeats (i.e. number of repeats
smaller or larger than 1), the number of repeats will change. Either
way, the effective end frame off the strip will be the one set in the
Frame End slider.
The old behavior of stretching time has been removed. It is still
possible to stretch time of a strip, but this no longer automatically
happens when manipulating the Frame Start and Frame End sliders.
**Technical details:** new RNA properties `frame_start_ui` and
`frame_end_ui` have been added. Changing those values (for example via
the sliders, but also via Python) trigger the above behavior. The
behavior of the already-existing `frame_start` and `frame_end`
properties has been simplified, such that these can be set from Python
without many side-effects, simplifying import of data into the NLA.
Reviewed By: sybren, RiggingDojo
Differential Revision: https://developer.blender.org/D14658