commit https://github.com/vim/vim/commit/885f24fbcae2a39ae496ffb3a1e139379be8fae1 Author: Bram Moolenaar <Bram@vim.org> Date: Mon Feb 1 22:54:46 2016 +0100 patch 7.4.1236 Problem: When "syntax manual" was used switching between buffers removes the highlighting. Solution: Set the syntax option without changing the value. (Anton Lindqvist)

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}\")