Undo of path move will unset colors that aren't 6 digit lowercase hex codes (e.g. #f00, red,#FF0000)

Summary:

After opening an existing SVG image file with a least one open path in Inkscape, making an edit to an open path, and then using the Undo operation, causes the fill and stroke of the path to become undefined, and thus the path disappears from view.

Steps to reproduce:

  1. Open existing SVG image file in Inkscape.
  2. Either select the path and move it with the "Select and transform objects" tool, or use the "Edit paths by nodes" to move a node.
  3. Either go to the Edit menu > Undo, or use Ctrl + Z shortcut key combination.

What happened?

The path's fill and stroke are set to undefined, causing the path to disappear from view.

What should have happened?

The path or path node is moved back to where it was before.

Notes: This bug does not appear to affect closed paths.

Sample attachments:

square_cursor_mask.svg

Version Info:

- Inkscape Version: 1.0.1
- Operating System: Windows 10 64-bit
- Operating System version: 10.0.19042
Edited by Nathan Lee