Blender Git Loki

Remove asset testing panel for the asset view template

There's a proper panel with the asset viewer now, for the poses. This
testing one will just confuse people.

Fix possible use of released stack memory

We'd store references to temporary objects, e.g. see
`AssetListStorage::ensure_list_storage()`. Stupid mistake, store a copy
of the `AssetLibraryReference` struct now (cheap to copy).

Support "Release Confirm" mode for the pose blending operator

This will make it possible to click and drag on the poses in the
asset view template to do the blending. On mouse release, the blended
pose will be applied.
This isn't used yet, follow-up commits will enable it.

This also hides the cursor and enables continuous grabbing when dragging
with the "Release Confirm" enabled. To be evaluated; maybe it should
always do this while blending.

Also fixes mouse hover highlights not being updated when confirming or
cancelling the pose blending operator.

Allow setting operator properties for the custom drag & activate OPs

The asset view template now provides a way to set the operator
properties of its custom drag & activate operators. In Python they are
returned from `UILayout.template_asset_view()` as tuple.

Includes some cleanup to better manage the data of the custom operators.

Prevent preview loading from triggering continuous redraws

The preview rendering notifiers would be continuously sent, causing
continuous redraws. In the File Browser that also happens (and I don't
think it's intentionaly) although it causes refreshes there that don't
do much and there won't be redraws unless necessary. Correcting this may
cause issues, so better to do it separately.

Issue is that the previews were fetched using the BLI_task API, and a
timer was started to send notifiers continuously. But there was nothing
to check if the tasks were done, so that the timer could be stopped.

Fix File Browser double-click not working while in pose mode

The pose apply operator would be invoked when double-clicking a
directory in the File Browser, while in pose mode.
The operator's poll would succeed because since 29887bbb329d, the
File/Asset Browser would just create a `AssetHandle` from the active
file received from context, without ensuring that the file actually
represents an asset.

Pose Library: correct status text when blending poses

Pose Library: remember last-used blend factor

When the interactive blending operator finishes, store the chosen blend
factor in the RNA properties. This ensures that pressing F9 shows the
actual factor, which can then be readjusted.

Pose Library: cleanly stop blending when quitting Blender

When Blender quits while the pose blending operator is active, set the
correct state (`POSE_BLEND_CANCEL`) before exiting, so that cleanup done
correctly.

Asset Browser: monitor subprocess after opening new Blender

Monitor the new blender subprocess from the "Open Blend File" operator,
and reload the asset browser after the subprocess stops.

Asset Browser: add "Open Blend File" operator to Asset browser context menu

Add an "Open Blend File" operator to the Asset Browser context menu,
which starts a new blender process to open the blend file containing the
active asset.

Merge remote-tracking branch 'origin/master' into asset-browser-poselib

Pose Library: remove use of `BONE_UNKEYED` bone flag

This bone flag was removed in rBfd10c21f51243921e645939e3f6a569c19864d8e.

No functional changes.

Pose Library: prevent auto-keying on linked Action

Prevent auto-keying when the current Action is a linked datablock.

Merge remote-tracking branch 'origin/master' into asset-browser-poselib

# Conflicts:
# release/scripts/addons
# source/blender/blenkernel/intern/armature_pose.cc
# source/blender/makesrna/intern/rna_ID.c

Pose Library: use mouse position to determine blend factor

Similar to the pose sliding tools, use the relative mouse position in the
active area to determine the pose blend factor.

This is not a final implementation, but at least makes the pose library
usable with a tablet.

Fix crash when applying pose from external repository in Asset Browser

The Asset Browser uses the `FileList` from the File Browser, which isn't
properly using the `AssetList` yet. So of course getting the file-path
from the asset list will fail.

For now just add a little hack to fall-back to get the data from the
Asset Browser directly.

Fix possible crash when blending poses

I did some casting hack to return an `AssetHandle` from a
`FileDirEntry`. But this doesn't actually work.

What I added now isn't something I'm happy with either, but it will have
to do for now. Basically we request an `AssetHandle`, which the Asset
Browser doesn't actually store, since it's just a wrapper around the
Asset Browser's `FileDirEntry`. So there is no consistent pointer the
editor could return to context queries, and the context needs a pointer
so that it can be passed around as `void *`.

Eventually once we have the planned asset storage design implemented,
the storage would include actual asset handles. So we can pass around
consistent pointers to them then.

Correct function names for changes in ui-asset-view-template branch

Cleanup: Use new utils provided by the asset system to get temp asset IDs

The operators are not exclusive to the File Browser anymore now. The logic to
get the asset file information and use that to append the ID if necessary is
abstracted away by the asset system now, see 10383566b800.