Allow control clicking on the rank stars in the filebrowser toolbar in order to show photos with multiple ranks. For example contol click on the 4th and 5th stars to show photos with rank 4 or 5. Unmodified clicks retain their old behaviour, and clear the multi-rank selection.

rtgui/filecatalog.h

@@ -132,6 +132,7 @@ class FileCatalog : public Gtk::VBox,
 #endif		
         std::vector<Glib::ustring> fileNameList;
         std::set<Glib::ustring> editedFiles;
+        guint modifierKey; // any modifiers held when rank button was pressed
 
         void addAndOpenFile (const Glib::ustring& fname);
         void checkAndAddFile (Glib::RefPtr<Gio::File> info);
@@ -177,6 +178,7 @@ class FileCatalog : public Gtk::VBox,
 				void setFilterPanel (FilterPanel* fpanel);
 				void exifInfoButtonToggled();
                 void categoryButtonToggled (Gtk::ToggleButton* b);
+                bool on_my_button_press_event(GdkEventButton* event);
                 void filterChanged ();
                 void runFilterDialog ();