support GtkSizeGroup and add tests (#53)

Add push! and delete! methods for GtkSizeGroup and tests for a method that returns a GList with transfer=none.

Also put a limit on the version of libpng, which prevents tests from failing on Windows x86. I assume this is a bug in one of the libraries and will look into it further later.

Project.toml

@@ -1,6 +1,6 @@
 name = "Gtk4"
 uuid = "9db2cae5-386f-4011-9d63-a5602296539b"
-version = "0.6.1"
+version = "0.6.2"
 
 [deps]
 BitFlags = "d1d4a3ce-64b1-5f1a-9ba4-7e7e69966f35"
@@ -14,6 +14,7 @@ Graphene_jll = "75302f13-0b7e-5bab-a6d1-23fa92e4c2ea"
 Graphics = "a2bd30eb-e257-5431-a919-1863eab51364"
 JLLWrappers = "692b3bcd-3c85-4b1f-b108-f13ce0eb3210"
 Libdl = "8f399da3-3557-5675-b5ff-fb832c97cbdb"
+libpng_jll = "b53b4c65-9356-5827-b1ea-8c7a1a84506f"
 Librsvg_jll = "925c91fb-5dd6-59dd-8e8c-345e74382d89"
 Pango_jll = "36c8627f-9965-5494-a995-c6b170f724f3"
 Preferences = "21216c6a-2e73-6563-6e65-726566657250"
@@ -36,6 +37,7 @@ Graphene_jll = "1.10"
 Graphics = "1"
 JLLWrappers = "1.4.0"
 Libdl = "1.6"
+libpng_jll = "<1.6.42"
 Librsvg_jll = "2.54"
 Pango_jll = "1.50"
 Preferences = "1"

src/base.jl

@@ -136,6 +136,9 @@ Returns a GListModel of all toplevel widgets (i.e. windows) known to GTK4.
 """
 toplevels() = G_.get_toplevels()
 
+push!(sg::GtkSizeGroup, w::GtkWidget) = (G_.add_widget(sg, w); sg)
+delete!(sg::GtkSizeGroup, w::GtkWidget) = (G_.remove_widget(sg, w); sg)
+
 @doc """
     display(w::GtkWidget)
 

test/gui/misc.jl

@@ -1,4 +1,4 @@
-using Test, Gtk4, Gtk4.G_
+using Test, Gtk4, Gtk4.G_, Gtk4.GLib
 
 @testset "get/set property and binding" begin
     w = GtkWindow("Window", 400, 300)
@@ -52,6 +52,24 @@ using Test, Gtk4, Gtk4.G_
     destroy(w2)
 end
 
+@testset "SizeGroup" begin
+    sg = GtkSizeGroup(Gtk4.SizeGroupMode_BOTH)
+    b = GtkLabel("#1")
+    b2 = GtkLabel("#2")
+    push!(sg, b)
+    push!(sg, b2)
+
+    widgets = Gtk4.widgets(sg)
+    @test length(widgets) == 2
+
+    @test Gtk4.size_request(b) == Gtk4.size_request(b2)
+
+    delete!(sg, b2)
+
+    widgets = Gtk4.widgets(sg)
+    @test length(widgets) == 1
+end
+
 @testset "Iteration and toplevel" begin
 ## example of last in first covered
 ## Create this GUI, then shrink window with the mouse