Hidden user for Geometry node group #86733

New Issue

Vyacheslav Kobozev · 2021-03-19T11:08:51+01:00

2021-03-19 11:08:51 +01:00

System Information
Operating system: Windows-8.1-6.3.9600-SP0 64 Bits
Graphics card: GeForce GTX 660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.40

Blender Version
Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-03-18 21:29, hash: 36deb8a48e

Short description of error
Node group after delete still have user and do not appear in Orphan Data outliner.

2021-03-19_13-02-52.mp4

Exact steps for others to reproduce the error

Open attached file or:
In the default Cube scene, open the Geometry Node editor
Press New and optionally rename to "1"
Duplicate the node tree and optionally rename "1.001" to "2"
In the node tree "2" add a group of the node tree "1" (If you switch to tree "1" you will see that tree "2" has 0 users)
Save the file with the tree "2" as the active
Reload the file saved
Switch to tree "1" (you will see that tree "2" still has users)
GN HiddenUser.blend

**System Information** Operating system: Windows-8.1-6.3.9600-SP0 64 Bits Graphics card: GeForce GTX 660 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 461.40 **Blender Version** Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-03-18 21:29, hash: `36deb8a48e` **Short description of error** Node group after delete still have user and do not appear in Orphan Data outliner. [2021-03-19_13-02-52.mp4](https://archive.blender.org/developer/F9899365/2021-03-19_13-02-52.mp4) **Exact steps for others to reproduce the error** - Open attached file or: - In the default Cube scene, open the Geometry Node editor - Press `New` and optionally rename to "1" - Duplicate the node tree and optionally rename "1.001" to "2" - In the node tree "2" add a group of the node tree "1" (If you switch to tree "1" you will see that tree "2" has 0 users) - Save the file with the tree "2" as the active - Reload the file saved - Switch to tree "1" (you will see that tree "2" still has users) [GN HiddenUser.blend](https://archive.blender.org/developer/F9899370/GN_HiddenUser.blend)

Vyacheslav Kobozev commented

2021-03-19 11:08:51 +01:00

Added subscriber: @Vyach

Germano Cavalcante commented

2021-03-22 19:05:47 +01:00

Changed status from 'Needs Triage' to: 'Confirmed'

Germano Cavalcante commented

2021-03-22 19:06:58 +01:00

Added subscriber: @mano-wii

Germano Cavalcante commented

2021-03-22 19:06:58 +01:00

Thanks for the report.
I can confirm and I found steps that tell us how to reproduce the problem from scratch.

Thanks for the report. I can confirm and I found steps that tell us how to reproduce the problem from scratch.

Vyacheslav Kobozev commented

2021-03-22 19:36:26 +01:00

@mano-wii thanks for testing and addition!

Jacques Lucke commented

2021-03-30 13:29:24 +02:00

Added subscriber: @JacquesLucke

Jacques Lucke commented

2021-03-30 13:29:24 +02:00

The reason is that the node editor has a reference to the visible node tree. This is a LIB_TAG_EXTRAUSER and is therefore for different from other "users". It is not removed automatically, probably because it is just a flag and it does not remember why the flag was set. The concept of an "extra user" seems a bit weak in this case, but changing that is outside of the scope of a bug report I think.
Note that when you save the file again when another node tree is shown in the node editor, the extra user is not there after another reload.

One related issue is that invisible node editors can also have references to node trees (they can be invisible when an area was changed from being a node editor to something else).

For reference, the extra user is set in BKE_screen_foreach_id_screen_area in the SPACE_NODE case.

The reason is that the node editor has a reference to the visible node tree. This is a `LIB_TAG_EXTRAUSER` and is therefore for different from other "users". It is not removed automatically, probably because it is just a flag and it does not remember why the flag was set. The concept of an "extra user" seems a bit weak in this case, but changing that is outside of the scope of a bug report I think. Note that when you save the file again when another node tree is shown in the node editor, the extra user is not there after another reload. One related issue is that invisible node editors can also have references to node trees (they can be invisible when an area was changed from being a node editor to something else). For reference, the extra user is set in `BKE_screen_foreach_id_screen_area` in the `SPACE_NODE` case.

Philipp Oeser removed the

Download

What's New

Blender Studio

Manual

Developers Blog

Documentation

Benchmark

Blender Conference

Development Fund

One-time Donations

Hidden user for Geometry node group #86733