better error message for keymap conflicts (minor)

diff --git a/lib/sup/keymap.rb b/lib/sup/keymap.rb
index e14ccbe0a4eecdb3507978f162521f59953eb9b2..3176415e84f6fd5e7b307f25ff2e801183a352a7 100644 (file)
--- a/lib/sup/keymap.rb
+++ b/lib/sup/keymap.rb
@@ -61,7 +61,7 @@ class Keymap
     @order << entry
     keys.each do |k|
       kc = Keymap.keysym_to_keycode k
-      raise ArgumentError, "key '#{k}' already defined (action #{action})" if @map.include? kc
+      raise ArgumentError, "key '#{k}' already defined (as #{@map[kc].first})" if @map.include? kc
       @map[kc] = entry
     end
   end