Improved smart delete key.

src/source.cc

@@ -1006,6 +1006,7 @@ bool Source::View::on_key_press_event(GdkEventKey* key) {
   //"Smart" delete key
   else if(key->keyval==GDK_KEY_Delete && !get_buffer()->get_has_selection()) {
     auto insert_iter=get_buffer()->get_insert()->get_iter();
+    if(!(insert_iter.starts_line() && insert_iter.ends_line())) {
       auto iter=insert_iter;
       bool perform_smart_delete=false;
       bool first_line=true;
@@ -1021,6 +1022,7 @@ bool Source::View::on_key_press_event(GdkEventKey* key) {
       if(perform_smart_delete && iter.backward_char())
         get_buffer()->erase(insert_iter, iter);
     }
+  }
 
   bool stop=Gsv::View::on_key_press_event(key);
   get_source_buffer()->end_user_action();