circle without cx cy attributes moves wrong on undo

Summary:

<circle> attributes like cx are optional and default to 0, but Inkscape ignores the default e.g. on undo.

Steps to reproduce:

• open Inkscape
• open circle-default-attributes.svg
• move the circle (e.g. using the mouse or arrow keys)
• Ctrl+Z (or Edit > Undo)

What happened?

The circle moves to some random position instead of its original position.

What should have happened?

The circle moves to its original position.

Related issues

• Deleting any of cx cy r using the XML Editor has no effect.
• Setting r=0 or r=-1 using the XML Editor has no effect (should disable rendering of the circle)

Version info

Tested on Arch Linux with:

• Inkscape 1.5-dev (f4c649c00a, 2024-11-30, custom)
• Inkscape 1.4 (bfbf874f89, 2024-11-23)
• Inkscape 1.0.2 (e86c870, 2021-01-15)
• Inkscape 0.92.5 (d4e9c2cd6d, 2021-12-24, custom)