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function: restore_ripflags <1> -- undo cut
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keyboard equivalent: cmd/alt-z

The "UNDO" button (lower right) swaps old and
current cuts (ripflags).  This toggles back and
forth between last two states of surface cuts.

Thus, this is a one-step-only undo/redo.

"UNDO" also unmarks all vertices.

To just unmark all vertices, do a R-click in the
surface display window.

See "INIT" and "ALL" for restoring initial cuts
or undoing all cuts.
