Adding the “Purge” button to the 3D Viewport header in Blender

Pressing the “Purge” button cleans the current open scene – removes all unused objects from it (mesh, nodes, materials, textures, etc.). However, this button is located very inconveniently, in the Outliner header and is visible only in the “Orphan Data” Outliner mode. For quick access to this button we can move it to the header of the 3D Viewport.

Dynamic operator description

Creating an operator in the Blender Python API, its description is usually specified in its “bl_description” parameter. However, quite often the same operator performs different actions in different cases, and a constant description does not describe all its capabilities. In this case, a dynamic description can be given to an operator.