Undo unavailable for Remove Vertex Group in edit mode #71980

New Issue

Stellarator Tokamak · 2019-11-27T19:53:04+01:00

2019-11-27 19:53:04 +01:00

System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 391.01

Blender Version
Broken: version: 2.82 (sub 1), branch: master, commit date: 2019-11-27 03:54, hash: 4fd99c9495

Bug description
After remove a vertex group from a mesh while in edit mode, the undo operator still works, but undo buffer does not seem to contain the remove vertex group operation, so using undo undoes whatever was done before the removal of vertex group. On entering object mode, using undo will undo the vertex group removal operation before any mesh editing, leading to confusing out-of-order undo operations

Repro steps:
Create new mesh
Create vertex group
Switch to edit mode
Move a vertex to make an obvious visible change
Remove vertex group
Move another vertex visibly
Switch to object mode
Use 'undo' operator multiple times
'undo' operator will undo vertex transforms, and appear to do nothing when it reaches the point in the undo buffer where it ought to undo 'remove vertex group'
Switch to object mode
Use 'undo' operator
Removed vertex group is back, and edit mode is active

I won't lay out all of the variations, but for more complicated failure modes with weirder out-of-order undo operations, try:

move vertex, remove group, move other vertex, switch to object mode, use undo function
create two vertex groups before entering edit mode, move vertex, delete first vertex group, move another vertex, delete second vertex group, move a third vertex. Enter object mode and use 'undo' operator

system-info.txt

**System Information** Operating system: Windows-10-10.0.18362 64 Bits Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 391.01 **Blender Version** Broken: version: 2.82 (sub 1), branch: master, commit date: 2019-11-27 03:54, hash: `4fd99c9495` **Bug description** After remove a vertex group from a mesh while in edit mode, the undo operator still works, but undo buffer does not seem to contain the remove vertex group operation, so using undo undoes whatever was done *before* the removal of vertex group. On entering object mode, using undo will undo the vertex group removal operation *before* any mesh editing, leading to confusing out-of-order undo operations **Repro steps:** Create new mesh Create vertex group Switch to edit mode Move a vertex to make an obvious visible change Remove vertex group Move another vertex visibly Switch to object mode Use 'undo' operator multiple times 'undo' operator will undo vertex transforms, and appear to do nothing when it reaches the point in the undo buffer where it ought to undo 'remove vertex group' Switch to object mode Use 'undo' operator Removed vertex group is back, and edit mode is active I won't lay out all of the variations, but for more complicated failure modes with weirder out-of-order undo operations, try: * move vertex, remove group, move other vertex, switch to object mode, use undo function * create two vertex groups before entering edit mode, move vertex, delete first vertex group, move another vertex, delete second vertex group, move a third vertex. Enter object mode and use 'undo' operator [system-info.txt](https://archive.blender.org/developer/F8172809/system-info.txt)

Stellarator Tokamak commented

2019-11-27 19:53:04 +01:00

Added subscriber: @AdrianPreston

blender-admin commented

2019-11-27 19:53:04 +01:00

#96192 was marked as duplicate of this issue

blender-admin commented

2019-11-27 19:53:04 +01:00

#92026 was marked as duplicate of this issue

blender-admin commented

2019-11-27 19:53:04 +01:00

#78022 was marked as duplicate of this issue

Stanislav Blinov commented

2019-11-27 23:31:44 +01:00

Added subscriber: @Stan_Pancakes

Stanislav Blinov commented

2019-11-27 23:31:44 +01:00

Brace for incoming "this is a limitation of current undo system". Which exists for eons now :(

Stellarator Tokamak commented

2019-11-27 23:54:04 +01:00

It wasn't present in 2.7x, if that helps. Has the undo system been redone?

Stanislav Blinov commented

2019-11-28 11:19:40 +01:00

It was present. You can't undo removal of vertex group in edit mode. In 2.7x and in 2.6x.

Stellarator Tokamak commented

2019-11-28 18:21:52 +01:00

Well I'll be damned. I just checked, and I could have sworn it worked, but you are right. Well, still... I guess it is for devs to decide if it is a bug or not, but it certainly isn't as the user would expect.

Jacques Lucke commented

2020-01-08 12:11:43 +01:00

Added subscriber: @JacquesLucke

Jacques Lucke commented

2020-01-08 12:11:43 +01:00

Unfortunately, that is probably a known limitation indeed..

Jacques Lucke commented

2020-01-08 12:12:27 +01:00

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

Germano Cavalcante commented

2020-06-19 19:59:25 +02:00

Added subscribers: @michaeleconomy, @mano-wii

Chris Kohl commented

2021-10-08 18:42:26 +02:00

Added subscriber: @ckohl_art

Pratik Borhade commented

2022-01-20 07:35:48 +01:00

Added subscribers: @borschberry, @PratikPB2123

Ethan-Hall commented

2022-03-06 22:05:08 +01:00

Added subscriber: @Ethan-Hall

Ethan-Hall commented

2022-03-06 22:05:08 +01:00

Blender currently prevents users from removing material slots while in edit mode. Can we similarly limit the ability to remove vertex weights and other attributes to protect users from out of order undo side effects until the undo system is reworked?

Pratik Borhade commented

2022-03-07 06:06:21 +01:00

Added subscriber: @Emwardicus

David Kintu commented

2022-04-27 13:27:47 +02:00

Added subscriber: @DaveyJolms

Philipp Oeser removed the

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Undo unavailable for Remove Vertex Group in edit mode #71980