Active shape key can now be changed while in edit mode. This is based
on exit/enter editmode again in the background, which is not ideal,
as that loses the undo history. But that already happened anyway when
you did exit/change-active/enter manually.
Blended shape keys can now be displayed & edited in edit mode. This
is much like showing an armature modifier in edit mode, and shape keys
now are a applied as a virtual modifier (for mesh & lattice only, curve
doesn't fit in the stack well due to tilt).
The main thing missing still is being able to switch between the active
shape key in edit mode, that's more complicated.. but the weights of
other shapes can be edited while in edit mode.
One thing to be careful about is that this does automatic crazyspace
correction, which means that if you edit a shape key with a low value,
the actual vertices will be moved to correct for that and actually move
a (potentially much) longer distance.
Also includes some UI tweaks, mainly placing some buttons horizontally
since the vertical list was getting too long.
* Curves/Surfaces now have the shape key panel as well, this
is new compared to 2.4x.
* The previous commit also fixed curve tilt blending for relative
keys, this was writing to the wrong memory location.
* Minor button tweaks
- added TexMesh access ([#19505] Missing option : TexMesh)
- Ctrl+Tab works again, not-so-nice workaround, disallow switching to paint modes from editmode, but would be nicer to manage this with keymaps.
