71273df2d5
Hierarchy lines (like we also have in the Outliner) make it easier to visually parse the hierarchy, and avoid confusion about nesting level. Especially when some items have icons and/or collapse chevrons and some not (thus different levels of visual indentation). They were planned for #93582 and #107881, also see https://code.blender.org/2023/05/the-next-big-step-grease-pencil-3-0/#layer-groups. The drawing is implemented as a general tree-view feature, so all tree-views with collapsable items (which excludes the spreadsheet data-set tree view) will get them without further setup.
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.
Project Pages
Development
License
Blender as a whole is licensed under the GNU General Public License, Version 3. Individual files may have a different, but compatible license.
See blender.org/about/license for details.