mouse: Set min-content-height on the scrolled window

Set a minimum content height of 490px for the panel when the
allocated height is smaller than 490px.

490 is an estimated value for the panels to properly fit on netbook
screens. See https://wiki.gnome.org/Design/SystemSettings#Notes

This also drops the max-content-height limit for the scrolled window,
as it is no longer necessary.

https://bugzilla.gnome.org/show_bug.cgi?id=771743

panels/mouse/gnome-mouse-properties.c

@@ -312,6 +312,20 @@ device_changed (GsdDeviceManager *device_manager,
 				show_touchpad_enabling_switch (d));
 }
 
+static void
+on_content_size_changed (GtkWidget     *widget,
+			  GtkAllocation *allocation,
+			  gpointer       data)
+{
+	if (allocation->height < 490) {
+		gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (widget),
+						GTK_POLICY_NEVER, GTK_POLICY_NEVER);
+	} else {
+		gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (widget),
+						GTK_POLICY_NEVER, GTK_POLICY_AUTOMATIC);
+		gtk_scrolled_window_set_min_content_height (GTK_SCROLLED_WINDOW (widget), 490);
+	}
+}
 
 static void
 cc_mouse_properties_finalize (GObject *object)
@@ -380,6 +394,8 @@ cc_mouse_properties_init (CcMouseProperties *object)
 	gtk_container_add (GTK_CONTAINER (object), WID ("scrolled-window"));
 
 	setup_dialog (d);
+
+	g_signal_connect (WID ("scrolled-window"), "size-allocate", G_CALLBACK (on_content_size_changed), NULL);
 }
 
 GtkWidget *

panels/mouse/gnome-mouse-properties.ui

@@ -21,7 +21,6 @@
     <property name="can_focus">True</property>
     <property name="shadow_type">none</property>
     <property name="hscrollbar_policy">never</property>
-    <property name="max_content_height">440</property>
     <child>
       <object class="GtkBox" id="prefs_widget">
         <property name="visible">True</property>