[BUG] Undo doesn't work when switching from free to tile mode

[cameron-toy]

Describe the bug

Switching from free to tile mode automatically moves/resizes outputs to fit the tile scale. These changes cannot be undone, even if the user switches back to free mode before undoing.

To Reproduce

Add an output to a dashboard in free mode. Switch to tile mode so the output resizes/moves to fit the tile scale. Switch back to free mode and attempt to undo.

Expected behavior

The outputs return to their original unaligned positions/sizes.

Screenshots/gifs

Context

• OS: macOS 10.15.5
• Browser: Safari 13.1.1
• JupyterLab Version: 2.1.4