Pose Bone data is lost when undoing an Edit Bone deletion. #64612
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Reference: blender/blender#64612
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Delete Branch "%!s(<nil>)"
Deleting a branch is permanent. Although the deleted branch may continue to exist for a short time before it actually gets removed, it CANNOT be undone in most cases. Continue?
Blender Version
Broken: 2.80,
e8daa61570
Short description of error
When deleting a bone, then undo-ing the deletion, the "Custom Object" property under Viewport DIsplay is lost, and so are all of the properties that show up when that property is in use(Bone Size, Scale, Custom Shape Transform)
Exact steps for others to reproduce the error
bone_delete_undo_bug.blend
Added subscriber: @Mets
Constraints also get lost in the same way. This is more important than the original report, but I feel like I shouldn't edit it now that it's been confirmed.
Added subscriber: @ideasman42
Added subscriber: @dr.sybren
It looks like more than one undo step is recorded for the deletion of a bone. When I delete the bone and then {key Ctrl Z} twice I get the custom shape and the constraints back.
Added subscriber: @mont29
I discussed this with @mont29, and he said it's a known issue. The problem is that an action can either store an undo step for edit mode (which doesn't include things outside of edit mode, such as the pose bone properties) or it can store the entire scene in memory (which doesn't include edito mode data). Deleting a bone changes both sets of data, so it cannot be properly un-done with just one step. This is a limitation that needs proper design work to resolve.
Bone's "Custom Object" (bone shape) is lost when undo-ing a bone deletion.to Pose Bone data is lost when undoing an Edit Bone deletion.Closed as duplicate of #50423