[Nano-devel] nano: more minor fixes

[David Lawrence Ramsey]

I've been insanely busy lately, but I've been able to do a bit of work
on nano.  I've been testing it for a few days and it appears to be
working well so far.

http://pooka_regent.tripod.com/patches/nano/nano120bits-patch.txt

Changes:

* ported DB's fix to preserve the cutbuffer between a marked cut and an
unmarked cut to 1.2.0-cvs vanilla

* modified the above to match Pico's behavior: a marked cut immediately
followed by an unmarked cut concatenates the two lines in the cutbuffer
instead of putting them on two separate lines

* ported DB's tweaking of UNSET(KEEP_CUTBUFFER) calls so that it's only
used when a shortcut key is hit that isn't the one for cutting text to
1.2.0-cvs vanilla

* modified the above to fix one instance where it should have been unset
but wasn't that cropped up during testing

* with the above, the only line left in goto_abort() was
display_main_list(), so to save the overhead of a function call,
goto_abort() was removed and replaced with display_main_list()

* modified uncut logic slightly to match Pico's behavior: when uncutting
on the magicline, create a new magicline just before uncutting the text
in all cases

* the charealloc() macro is defined as (char *)nrealloc(), but the
former is used in only one place while the latter is used many times in
many places; fix this so charealloc() is used in all those places (and,
since it also handles multiplying the size value by sizeof(char), remove
that from the calls that had it)

* when a bracket search fails, all update_line() after resetting current
and current_x, since otherwise the line won't be updated properly when
the current position on the line is greater than the screen width


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