Add valgrind suppression file

src/apprt/gtk-ng/class/application.zig

@@ -585,8 +585,8 @@ pub const Application = extern struct {
             self.as(Parent),
         );
 
-        // const win = Window.new(self);
-        // gtk.Window.present(win.as(gtk.Window));
+        const win = Window.new(self);
+        gtk.Window.present(win.as(gtk.Window));
     }
 
     fn dispose(self: *Self) callconv(.C) void {

src/apprt/gtk-ng/class/config_errors_dialog.zig

@@ -101,15 +101,17 @@ pub const ConfigErrorsDialog = extern struct {
     }
 
     fn dispose(self: *Self) callconv(.C) void {
-        log.warn("DISPOSE", .{});
-        gtk.Widget.disposeTemplate(self.as(gtk.Widget), getGObjectType());
-
         const priv = self.private();
         if (priv.config) |v| {
             v.unref();
             priv.config = null;
         }
 
+        gtk.Widget.disposeTemplate(
+            self.as(gtk.Widget),
+            getGObjectType(),
+        );
+
         gobject.Object.virtual_methods.dispose.call(
             Class.parent,
             self.as(Parent),

src/apprt/gtk-ng/class/window.zig

@@ -33,6 +33,18 @@ pub const Window = extern struct {
         gtk.Widget.initTemplate(self.as(gtk.Widget));
     }
 
+    fn dispose(self: *Self) callconv(.C) void {
+        gtk.Widget.disposeTemplate(
+            self.as(gtk.Widget),
+            getGObjectType(),
+        );
+
+        gobject.Object.virtual_methods.dispose.call(
+            Class.parent,
+            self.as(Parent),
+        );
+    }
+
     pub fn as(self: *Self, comptime T: type) *T {
         return gobject.ext.as(T, self);
     }
@@ -59,6 +71,8 @@ pub const Window = extern struct {
                     .name = "window",
                 }),
             );
+
+            gobject.Object.virtual_methods.dispose.implement(class, &dispose);
         }
 
         pub fn as(class: *Class, comptime T: type) *T {