Make sure that the state is consistent after an undo operation

When performing an undo operation, further changes should not be
accounted to the then active action. Therefore take a snapshot
which resets txt->current_action to NULL.

1 files changed, 2 insertions, 0 deletions

diff --git a/text.c b/text.c
index ad422c5..a9685e4 100644
--- a/text.c
+++ b/text.c
@@ -550,6 +550,8 @@ bool text_insert(Text *txt, size_t pos, const char *data) {
 
 size_t text_undo(Text *txt) {
 	size_t pos = -1;
+	/* taking a snapshot makes sure that txt->current_action is reset */
+	text_snapshot(txt);
 	Action *a = action_pop(&txt->undo);
 	if (!a)
 		return pos;