Index: trunk/src/org/openstreetmap/josm/gui/datatransfer/importers/AbstractTagPaster.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/datatransfer/importers/AbstractTagPaster.java	(revision 18609)
+++ trunk/src/org/openstreetmap/josm/gui/datatransfer/importers/AbstractTagPaster.java	(revision 18610)
@@ -62,5 +62,10 @@
     protected static void commitCommands(Collection<? extends OsmPrimitive> selection, List<Command> commands) {
         if (!commands.isEmpty()) {
-            String title1 = trn("Pasting {0} tag", "Pasting {0} tags", commands.size(), commands.size());
+            final int changedTags = commands.stream()
+                    .filter(ChangePropertyCommand.class::isInstance)
+                    .map(ChangePropertyCommand.class::cast)
+                    .mapToInt(p -> p.getTags().size())
+                    .sum();
+            String title1 = trn("Pasting {0} tag", "Pasting {0} tags", changedTags, changedTags);
             String title2 = trn("to {0} object", "to {0} objects", selection.size(), selection.size());
             @I18n.QuirkyPluralString