[Bug 263084] vt: Paste pads from EOL to end of screen with whitespace characters

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263084

Ed Maste <emaste@freebsd.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|New                         |Open
           See Also|                            |https://bugs.freebsd.org/bu
                   |                            |gzilla/show_bug.cgi?id=2609
                   |                            |63

--- Comment #4 from Ed Maste <emaste@freebsd.org> ---
(In reply to Stefan B. from comment #3)
So both sc and vt are buggy, but sc's bug is definitely less objectionable.

Keeping track of "printed a space" vs "empty" character cells will be needed to
properly address this and PR260963, but until that happens we should handle it
the same way as sc.

Presumably just:

for each line in copied region:
    if RH column contains space
        copy full line to selection buffer
    else
        search backwards to find last non-space char
        copy line from first col until last non-space to selection buffer
        add \r\n

src reference: vtbuf_extract_marked()

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