Blender Git Loki

Assorted anim editor fixes
* Click-select operators don't have "register" flag anymore
* Graph Editor click select can be undone, just like everything else
* "Current frame" -> "Current Frame" for consistency with rest of menu

NLA "Add Track" can now be used to add tracks to previously empty AnimData
blocks, provided the blocks in question are in fact selected.

Any ID Selector Template: ID Type dropdown now shows icon only as originally
intended

Finally, I've figured out a way to get the ID Selector Template to only show the
icon for the type of ID block (i.e. the intended design), instead of icon+text.
This improves the layout a bit, as previously the type selector and ID-block
pointer and label would all be the same sizes (roughly 1/3rd of the overall
width each), which meant that there wasn't much room left to actually see which
datablock had been selected.

Additionally, I've fixed a few more layout types which still didn't correctly
propagate the red-alert flags.

Assorted small fixes
* Incorrect comment (copy+paste error) in nla_edit
* Whitespace in rna_gpencil
* The icon for AnimData is now attached to its RNA definition

NLA Editor: Show the ID+AnimData block that the AnimData panel is showing the
active action for

object converting curve/mball to a mesh would give invalid selection state (edges selected but nothing else).
add arg to BKE_mesh_calc_edges() so selecting newly created edges is optional.

fix for own mistake in using alloca in a loop, replace with BLI_buffer

changes to BLI_buffer
- assert if BLI_buffer_at() is called with an out of bounds value.
- add BLI_buffer_resize_data() macro which resizes and returns a pointer to the new array.
- warn if missing call to BLI_buffer_free().

correct lasso, weightpaint select, was calling BLI_lasso_boundbox() twice.

code cleanup: quiet some -Wshadow warnings, mix of obvious mistakes and harmless global/local naming conflict.

minor cleanup and calculate rake angle before jittering or result
becomes essentially, random

knife project improvements
When running in non-interactive mode, dont add a area draw callback or adjust the cursor, use a fixed snap value and don't use opengl lookups on faces.
Minor optimization - compare squared distances where possible.

fix for error pasting into a color button (tried to read its rna index of -1)

Fix: multisample viewport drawing didn't work well with selection or particle
brushes, due to issues with color coded drawing or slow/buggy reading from such
a buffer on some systems.

In case multisample is enabled now, it uses an offscreen buffer for such drawing,
which is not multisampled and so should not cause issues. This does mean there is
some extra GPU memory usage when multisample is enabled, and we could optimize
triple buffer to work together here somehow to share buffers, but it's better than
having selection not working.

Screen: add exit callback for area and region types, this gets called when
hiding or removing an area or region.

knife project: improve selection inside/outside checks.
- use more accurate method to find if a face is inside projected lines.
- check faces intersect while expanding selection - in some cases this could result in the entire model being selected.

use bool for knife, also scons tab/space mix.

Compile fix:
* Scons needed PThread include after recent movie clip changes.

Further improvement for multi-threaded proxies

Handle sequences in a special case for dealing with
sequence sources.

Namely handle separate frames in separate threads,
but do disk read from a critical section since HDD
is not so friendly with lots threads requesting for
data from it.

Makes proxy building much faster than it was before.

Fix #34649: texture size limit user preference not working.