Text Editor: Missing undo for text operators when in edit mode #80611
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Reference: blender/blender#80611
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System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1080/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.87
Blender Version
Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-09-07 08:12, hash:
b351607996
Worked: Some time before binary diffing was implemented maybe?
Short description of error
Note: This is about text editor operators, nothing to do with Text objects in the viewport.
Custom text operators that modify the text (text.body, text.write(), etc.) are missing undo steps IFF an object is in edit mode.
When an object is in object mode, however, the undo works as expected.
Text operators implemented in C work fine. Assuming the solution is letting custom operators push or tag undo like internal ones.
Exact steps for others to reproduce the error
example.blend
Added subscriber: @KaiJaegersen
Added subscriber: @mano-wii
The undo system is confusing.
There are many reports on global undo that seem to be related.
The text editor has its own undo context, but apparently it doesn't work on python operators.
Maybe this system needs to be rewritten (there are already tasks designed to do this #68068, #71735)
I'm not sure if this is something that can be fixed in a short time.
Thanks, I've been looking for those tasks. I wasn't sure if there was a specific report for this.
A workaround to getting undo to work in edit mode for custom operators is to register a
Macro
which defines two operators:TEXT_OT_insert
The result is that the macro is able to piggyback the undo pushed by
TEXT_OT_insert
.While this works it requires a macro operator, and the code just becomes confusing for others to read.
Changed status from 'Needs Triage' to: 'Confirmed'
Added subscriber: @ideasman42
We need to expose undo for text operators written in Python, currently in C this is done explicitly, it would be nice to avoid begin/end calls to the undo system although I don't see good way around this (that doesn't further complicate undo).
Added design task which links to this task.
Closed as duplicate of #80864