patch 8.0.1433: illegal memory access after undo commit https://github.com/vim/vim/commit/95dbcbea6d85a5b79d9617ab3863458fdf0217a0 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Jan 27 21:01:34 2018 +0100 patch 8.0.1433: illegal memory access after undo Problem: Illegal memory access after undo. (Dominique Pelle) Solution: Avoid the column becomes negative. (Christian Brabandt, closes #2533)

TYPEMAP
VIWIN	T_VIOBJNOMUNGE
VIBUF	T_VIOBJNOMUNGE

INPUT
T_VIOBJNOMUNGE
	if (sv_isa($arg, \"${ntype}\")) {
	    IV tmp = SvIV((SV*)SvRV($arg));
	    $var = INT2PTR($type, tmp);
	    if (!tmp)
		croak(\"$ntype no longer exists\");
	}
	else
	    croak(\"$var is not of type ${ntype}\")