The view counts the Apply redactions steps in effect instead of keeping a
flag: Undo of an Apply redactions step takes one off, Redo adds it back,
and Revert, Reload and a desktop save set it to 0. Save after undoing every
Apply redactions step, or after Revert, writes the opened file in place.
The Save As choice after Apply redactions is made before the desktop and
web paths split, so an embedding page (`?host=parent`) receives Save As
with the `_Redacted` name.