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* Automatically draw text.
Text::draw() should be called from propeller-clock.cc, and it should itterate
over active messages and call draw_message() on them (which does what the
current draw() does).
This requires that Text somehow knows which messages are active. Perhaps
message_reset() could somehow be used to determine this?
This is necessary so that the cludgy call to Text::post_draw() can be removed
from propeller-clock.cc. The problem here is that if _do_draw_reset is set
false inside what is currently Text::draw(), only the first drawn message is
ever correctly reset!
This would also make calls to Text::draw() unnecessary from mode draw()
routines.
At the same time, remove calls to Text::reset() from SwitcherMajorMode. This
now be done at the start of reset_messages(), which should be renamed to
set_up_messages() in all modes.
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