Undo keyboard shortcut inconsistent in Attribute Table

[Houska1]

What is the bug or the crash?

In the attribute editor, the undo (Ctrl-Z) shortcut seems to only undo changes in the the current field, but does not undo changes made once focus shifts to another field or another record.

Note Undo via the menu action on the main window (or Attribute toolbar) does work.

Steps to reproduce the issue

Open a vector layer with >1 text fields for editing in attribute editor (form or table view)
Change the contents of a text field A-->B.
Without changing fields, Ctrl-Z undoes B-->A as expected.
But if instead you first shift focus to another text field, or other record, Ctrl-Z no longer does anything.

Versions

3.20.3, 3.21 Master, Windows

Supported QGIS version

• I'm running a supported QGIS version according to the roadmap.

New profile

• I tried with a new QGIS profile

Additional context

Separated this out as separate bug report per discussion at #45056

Prompted by https://gis.stackexchange.com/questions/411533/undo-single-edit-in-attribute-table-qgis/411535