450f428434
This was quite involved to get to work. Basic idea is to make `bl_activate_operator` work for the pose library asset shelf, and introducing a `bl_drag_operator` for blending poses. - Make pose asset operators take an asset reference, which is how `bl_activate_operator` usually gets the asset to operate on. This way poses references can be assigned to a shortcut, identified by asset library and relative asset path within the library. Falls back to getting the asset from context. - Trigger `bl_activate_operator` on every click, instead of only when an un-active item becomes active. Needed so poses can be re-applied as before. - Fix button context not passed to the `bl_activate_operator` when force-activating, e.g. on right-click events. - Allow registering a `bl_drag_operator` in the asset shelf definition. Executed when dragging an asset in the shelf. - When dragging an asset, highlight it as active, without calling the `bl_activate_operator`. This is important feedback to the user. - Activate/select view items on click instead of drag, so dragging is possible. - Let pose applying operators handle the Ctrl key to apply poses flipped. There's no simple way to attach such alternative behaviors to `bl_activate_operator`/`bl_drag_operator` - Remove keymap items that were there for the previous "hacky" solution to apply & blend poses. Pull Request: https://projects.blender.org/blender/blender/pulls/144023
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