39e54fbd96
After opening a file, an immediate "u"/":undo" would remove the entire contents of the buffer. Even worse, this would not set 'modified', so there would be no indication that wasn't the actual initial state of the buffer. Discarding undo history for a buffer requires a few steps, including making a change. Luckily, a change is already being made (deleting the extra line left after ":r !" the decrypted file), so discarding undo history can piggy-back on top of that. Signed-off-by: James McCoy <vega.james@gmail.com>