set vexpand/hexpand to true in constructor

This is what the default was in GTK3, I think.
JuliaGizmos · Mar 19, 2024 · 06d56ac · 06d56ac
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commit 06d56ac
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diff --git a/Project.toml b/Project.toml
@@ -1,6 +1,6 @@
 name = "GtkObservables"
 uuid = "8710efd8-4ad6-11eb-33ea-2d5ceb25a41c"
-version = "2.0.5"
+version = "2.0.6"
 
 [deps]
 Cairo = "159f3aea-2a34-519c-b102-8c37f9878175"

diff --git a/src/graphics_interaction.jl b/src/graphics_interaction.jl
@@ -303,6 +303,9 @@ struct Canvas{U}
 
     function Canvas{U}(w::Int=-1, h::Int=-1; own::Bool=true, init_back=false, modifier_ref=nothing) where U
         gtkcanvas = GtkCanvas(w, h, init_back)
+        # let canvas grow to fill available space
+        Gtk4.hexpand(gtkcanvas,true)
+        Gtk4.vexpand(gtkcanvas,true)
         # Initialize handlers
         mouse = MouseHandler{U}(gtkcanvas, modifier_ref)
         grab_focus(gtkcanvas)