Within the CLI, inserting a character works by writing out the new char
and then all the ones after it.
With the truetype console this results in gibberish since the new
chars are written on top of the old. To resolve this, clear the rest of
the input when a character is inserted. Consider that the end of the
input, at least until furture characters are written.
As an optimisation, don't clear if the new character is the same as the
old.
This cleans up a dot above the 'g' of greatness which should not be
there, so update the dm_test_video_truetype() test.
It also clean up the part of the 't' of 'not be' which should not be
there, so update dm_test_video_truetype_bs() too.
Signed-off-by: Simon Glass <sjg@chromium.org>
81675eff4a