Canvas becomes unmanageable while the Document Properties dialog is open

Summary

1.1-dev (2d58738ffd, 2020-12-11)
1.1-dev (fe4bc476a7, 2020-12-14)
# MX Linux (19.3 amd64) (XFCE 4.14)
# GTK (3.24.5) (Plane Dark)

While the Document Properties dialog remains open, the canvas and all related actions (selection box, drag and drop, drawing, etc.) become unresponsive/laggy. Random crashes could happen.

Reproduction

• Open Inkscape && Close the Welcome Screen (ESC)
• Open the Document Properties dialog (Ctrl + Shift + D)
• Make a selection box (Click and drag in the canvas)

Consecuences

You will see how there is a delay between the click release and the selection box to disappear.

Expectations

There should be no performance impacts while it is open.