Properly deallocate memory when clearing selection_op_history and

before XMLNode*s.
Improve some comments.

1 files changed, 1 insertions, 1 deletions

diff --git a/libs/pbd/undo.cc b/libs/pbd/undo.cc
index 2da9c7214d..182773ee49 100644
--- a/libs/pbd/undo.cc
+++ b/libs/pbd/undo.cc
@@ -220,7 +220,7 @@ UndoHistory::add (UndoTransaction* const ut)
 	}
 
 	UndoList.push_back (ut);
-	/* Adding a transacrion means that redo is meaningless from this point. */
+	/* Adding a transacrion makes the redo list meaningless. */
 	_clearing = true;
 	for (std::list<UndoTransaction*>::iterator i = RedoList.begin(); i != RedoList.end(); ++i) {
                 delete *i;