Canvas in Gtk doesn't work while the loop is running

[tobias.knopp]

Please have a look at

Setting size of GtkCanvas and other widgets

I’m wanting to make a GUI with several items - I made a GtkBox(:v), and pushed in a GtkBox(:h), followed by a GtkCanvas(), then another GtkBox(:h). The hBoxes contain buttons, labels, etc. When I call showall(win) it brings up the two hBoxes Ok, but the canvas is sqeezed down to a thin line. What I want is for it to fill the space between the hboxes. If I call GtkCanvas(width,height) then that gives me a useable canvas, but it prevents me from resizing the window to less than that size. I t…

where I give a minimal example that works.