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Unicode 0xFFFD (Replacement Character) into it using strncpy() instead
of assigning the former to it; this avoids segfaults when freeing crep
later, since it's supposed to be dynamically allocated


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line, as this was only used in do_backspace(), and it didn't always
update the screen properly


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character's a tab, which can be possible if there are enough tabs and
the terminal size is sufficiently large, don't try to display it using
control_mbrep()


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mention the need for regex.h


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as it depends on the use of regexes


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properly if it was inside the text moved to another filestruct; also add
comment fixes and miscellaneous cleanups to it and
copy_from_filestruct()


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option, to control whether the word movement functions treat punctuation
characters as part of a word


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