add address type to receive tab in GTK GUI

I = imported
R = receive
C = change

gui/gtk.py

@@ -941,7 +941,7 @@ class ElectrumWindow:
 
 
     def create_recv_tab(self):
-        self.recv_list = gtk.ListStore(str, str, str)
+        self.recv_list = gtk.ListStore(str, str, str, str)
         self.add_tab( self.make_address_list(True), 'Receive')
         self.update_receiving_tab()
 
@@ -987,6 +987,13 @@ class ElectrumWindow:
         tvcolumn.pack_start(cell, True)
         tvcolumn.add_attribute(cell, 'text', 2)
 
+        if is_recv:
+            tvcolumn = gtk.TreeViewColumn('Type')
+            treeview.append_column(tvcolumn)
+            cell = gtk.CellRendererText()
+            tvcolumn.pack_start(cell, True)
+            tvcolumn.add_attribute(cell, 'text', 3)
+
         scroll = gtk.ScrolledWindow()
         scroll.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_AUTOMATIC)
         scroll.add(treeview)
@@ -1100,12 +1107,14 @@ class ElectrumWindow:
     def update_receiving_tab(self):
         self.recv_list.clear()
         for address in self.wallet.addresses(True):
-            if self.wallet.is_change(address):continue
+            Type = "R"
+            if self.wallet.is_change(address): Type = "C"
+            if address in self.wallet.imported_keys.keys(): Type = "I"
             label = self.wallet.labels.get(address)
             h = self.wallet.history.get(address,[])
             n = len(h)
-            tx = "None" if n==0 else "%d"%n
+            tx = "0" if n==0 else "%d"%n
-            self.recv_list.append((address, label, tx ))
+            self.recv_list.append((address, label, tx, Type ))
 
     def update_sending_tab(self):
         # detect addresses that are not mine in history, add them here...