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This frame will help to maintain a file on disk for the wx:media-buffer% returned by its get-edit. That buffer must be derived from either a mred:file-edit% or a mred:file-edit%.
This frame maintains some status information at the bottom of the frame, about the state of the edit returned by the method get-info-edit.
It displays a pad-lock icon when the edit is locked, and an unlocked pad-lock when it is unlocked, see lock. It displays ``Overwrite'' when the edit is in overwrite mode, see set-overwrite-mode and an icon of an anchor when the buffer get-anchor returns true.