vi: allow 'r' command to be aborted, repeated

Make the 'r' command behave more like vi:

- abort the command if ESC is entered after the 'r';

- allow a repeat count to be entered before the 'r';

- if the repeat count exceeds the space available on the line don't
  change any characters and issue an alert.

function                                             old     new   delta
do_cmd                                              4679    4746     +67
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(add/remove: 0/0 grow/shrink: 1/0 up/down: 67/0)               Total: 67 bytes

v2: Don't break build when FEATURE_VI_UNDO is disabled.

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
1 file changed