blocking wgetch() returns ERR and errno is set to EIO (input/output
error); if errno is set to something else, recover properly; this fixes
problems with nano's erroneously hanging up while e.g. resizing or
unsuspending in a chroot


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@3038 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

simplified by me


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allocating enough space for (COLS + 1) characters


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VT100/VT220/VT320/xterm/rxvt escape sequence for ',' on the numeric
keypad with NumLock off from being interpreted properly


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on lines containing tabs


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middle of a multibyte character


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allocating enough space for COLS characters


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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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