working favourite button

MainWindow.cs

@@ -265,6 +265,9 @@ namespace Buypeeb {
 				l.Text = row.Value;
 			}
 
+			var f = (ToggleButton)this.builder.GetObject("ButtonSelectedFavourite");
+			f.Active = item.favourite;
+
 		}
 		private void OpenUrl(string url) {
 			// https://github.com/dotnet/runtime/issues/17938
@@ -423,6 +426,11 @@ namespace Buypeeb {
 			this.UpdateItem(this.selectedItem.id);
 		}
 
+		private void ButtonSelectedFavouriteToggled(object sender, EventArgs args) {
+			ToggleButton s = (ToggleButton)sender;
+			this.selectedItem.favourite = s.Active;
+		}
+
 		// timers
 
 		private bool UpdateSelectionEndTime() {

ui/main.glade

@@ -705,6 +705,7 @@
                                 <property name="can_focus">True</property>
                                 <property name="receives_default">True</property>
                                 <property name="tooltip_text" translatable="yes">Favourite</property>
+                                <signal name="toggled" handler="ButtonSelectedFavouriteToggled" swapped="no"/>
                                 <child>
                                   <object class="GtkImage" id="image3">
                                     <property name="visible">True</property>