bug#41440: 26.3; 'replace' argument in function 'shell-command-on-region' is assumed to be always t for rectangle selection

[Warren Lynn <wrn.lynn@gmail.com>]

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Hi:

I am gladly surprised to find out function
shell-command-on-region
is supposed to work on rectangle selection also (with
'region-noncontiguous-p' set to t), but then disappointed to find out the
feature does not work. It has two problems:

1. As this email title says, argument 'replace' is assumed to be t no
matter what.
2. Even if I really want to replace the original selection with the
shell-command output, it still does not work. An error will be thrown in
function "cua--insert-rectangle" due to some argument type mismatch.

This feature will be very useful to me (and hopefully others too) and I
hope somebody can fix the above.

Thanks a lot.

Warren

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