4525527852
No user visible changes expected, these are just the internal API preparations. Modifies the Drop API for views so that tree-views can choose to insert items before, after and into other items. Note: While there is support for drag-tooltips that can explain how an item will be inserted, there is no drawing yet like in the Outliner, that indicates if an item is inserted before, after or into. There is some work on that but that can be done separately. Changes: - Removes `AbstractViewDropTarget` that was shared between tree- and grid-views, and adds `AbstractTreeViewDropTarget` and `AbstractGridViewDropTarget`. The tree-view needs specialized handling now, and although they could share some code still, it's not worth having another level of inheritance. - Modifies the drop-target API to use `DragInfo` which contains more info about the dragging operation than just the `wmDrag`. - Adds `determine_drop_location()` to the `DropTargetInterface` which drop targets can use to determine when dropping means inserting before, after or into. - Store the block and region in the view. This is needed unfortunately but shouldn't be an issue since the tree view is recreated on redraws, together with the block. - Various smaller tweaks and additions to views as needed. TODO (outside scope of this change): Increase row height so there is no gap between tree view items, but keep things visually the same otherwise. This reduces flickering while dragging. Pull Request: https://projects.blender.org/blender/blender/pulls/109825
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