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When dropping an asset somewhere, it is appended and then a drop operation is called to actually add it to the scene based on current context. If this drop operation fails, the appended data-block is now still in the .blend. The user may not notice and not expect this. Instead idea is to rollback any changes done by dropping code if the operation fails, namely removing the appended data-block again. Adds a new `cancel()` callback which is called if the drop operator returns `OPERATOR_CANCELLED` to drop-boxes and a generic function to deal with assets on drop failure. Also removes the `free_id_on_error` property of the `NODE_OT_add_group` operator, which was used as ad-hoc solution to get this same behavior.
.. Keep this document short & concise, linking to external resources instead of including content in-line. See 'release/text/readme.html' for the end user read-me. Blender ======= Blender is the free and open source 3D creation suite. It supports the entirety of the 3D pipeline-modeling, rigging, animation, simulation, rendering, compositing, motion tracking and video editing. .. figure:: https://code.blender.org/wp-content/uploads/2018/12/springrg.jpg :scale: 50 % :align: center Project Pages ------------- - `Main Website <http://www.blender.org>`__ - `Reference Manual <https://docs.blender.org/manual/en/latest/index.html>`__ - `User Community <https://www.blender.org/community/>`__ Development ----------- - `Build Instructions <https://wiki.blender.org/wiki/Building_Blender>`__ - `Code Review & Bug Tracker <https://developer.blender.org>`__ - `Developer Forum <https://devtalk.blender.org>`__ - `Developer Documentation <https://wiki.blender.org>`__ License ------- Blender as a whole is licensed under the GNU Public License, Version 3. Individual files may have a different, but compatible license. See `blender.org/about/license <https://www.blender.org/about/license>`__ for details.