Scene size and margins by Format menu

[n1c0la5]

When I try to delete a number pressing the key return, no problem, but when I want to delete y¡the first (5 for 550 (largeur), 4 for 440(height) and 8 for 80(margins)), the default value come back (550, 440 and 80).
The only way to change is to get to the top of the box, removes a figure replaces the one you want, etc.. (thanks kevlar)

[Kevlar (amiluc-bis)]

It's a known light, very light "bug", due to Gtk management of certains widgets