Helper lines visible when trying to move a pinned element

[pcdavid]

Steps to reproduce:

1. Open a diagram with at least two elements.
2. Enable the helper lines.
3. Select an element an pin it.
4. Try to move it. It does not move (as expected), but depending on where you move the mouse cursor the helper lines are still drawn.

Capture.video.du.2024-03-12.10-50-31.webm