undo/redo queues seem to leak between properties

[flack]

Steps to repoduce:

• go to edit mode
• focus an editable property and enter some characters
• focus another editable property
• Click "undo"

Expected results:

• nothing happens since the currently active property has no modifications

Actual results:

• The change made in step two in the previously focused property is reverted
• The cursor is moved to the previously focused property, but it doesn't react to keyboard input and the wrong editor toolbar is shown.

[bergie]

This is a Hallo issue, can you reopen this there?