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(viper)Replace State

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Replace State
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   This state is entered through Vi replacement commands, such as `C',
`cw', etc., or by typing `R'.  In Replace state, Viper puts <R> in the
mode line to let you know which state is in effect.  If Replace state is
entered through `R', Viper stays in that state until the user hits
<ESC>.  If this state is entered via the other replacement commands,
then Replace state is in effect until you hit <ESC> or until you cross
the rightmost boundary of the replacement region.  In the latter case,
Viper changes its state from Replace to Insert (which you will notice
by the change in the mode line).

   Since Viper runs under Emacs, it is possible to switch between
buffers while in Replace state.  You can also move the cursor using the
arrow keys (even on dumb terminals!) and the mouse.  Because of this
freedom (which is unattainable in regular Vi), it is possible to take
the cursor outside the replacement region.  (This may be necessary for
several reasons, including the need to enable text selection and
region-setting with the mouse.)

   The issue then arises as to what to do when the user hits the <ESC>
key.  In Vi, this would cause the text between cursor and the end of
the replacement region to be deleted.  But what if, as is possible in
Viper, the cursor is not inside the replacement region?

   To solve the problem, Viper keeps track of the last cursor position
while it was still inside the replacement region.  So, in the above
situation, Viper would delete text between this position and the end of
the replacement region.