(calendar-mode-map): Use calendar-mark-holidays rather than obsolete alias.
(mark-visible-calendar-date): Also use overlay for mark characters. (calendar-unmark): Unmark by removing all overlays, rather than redrawing. (calendar-starred-day): Remove. (calendar-mode): Disable undo. Don't make calendar-starred-day local. (calendar-cursor-to-date): No need for special star handling now using overlays. (calendar-star-date): Use overlays.
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