Addresses #146305.
Ever since moving to the "sequencer scene" paradigm, attempting to
render an image or animation when a sequencer with strips is present
often seems to outright ignore the sequencer in most cases. This is
because the sequencer scene usually differs from the active scene (which
is the true render target), so one must first switch their active scene
to the sequencer scene before rendering. This is confusing and
seems like a regression in behavior. To improve clarity, this patch does
the following:
When a sequencer scene with at least one strip (and the sequencer step
enabled in the pipeline) exists in the current workspace, new options
"Render Sequencer Image" and "Render Sequencer Animation" appear. These
options may be invoked by alt-F12 and ctrl-alt-F12, respectively.
Additionally, if such a valid sequencer scene is the same as the active
scene, then only the regular render options are listed, since in this
case they are identical to the sequencer render operators, meaning F12
still works predictably.
To switch back and forth between sequencer and main scene render
outputs, a new toggle has been added to the image editor to "Show
Sequencer Scene" output. This button only appears for the render result
if there is a valid sequencer scene that differs from the active scene.
Pull Request: https://projects.blender.org/blender/blender/pulls/146934
76c03744a8