ClickableNicknamesPlugin.[Andrey Musikhin].Insert nick in the middle of the message

clickable_nicknames/clickable_nicknames.py

@@ -126,10 +126,16 @@ class Base(object):
                 self.chat_control.room_jid)
             if nick not in nicks:
                 return
+
             message_buffer = self.chat_control.msg_textview.get_buffer()
-            if message_buffer.get_char_count() < 2:
+            if message_buffer.get_char_count() < 1:
                 nick = nick + gajim.config.get('gc_refer_to_nick_char')
-            nick = nick + ' '
+            else:
+                start, end = message_buffer.get_bounds()
+                if message_buffer.get_text(start, end, True)[-1] != ' ':
+                    nick = ' ' + nick
+            nick += ' '
+
             message_buffer.insert_at_cursor(nick)
             self.chat_control.msg_textview.grab_focus()