patch for https://github.com/vim-jp/issues/issues/765

setwinvar_do_not_trigger_autocmd.patch

diff -r 917ffa98aeeb src/eval.c
--- a/src/eval.c	Wed Sep 09 22:45:04 2015 +0200
+++ b/src/eval.c	Fri Sep 11 16:17:55 2015 +0900
@@ -12446,6 +12446,9 @@
 	 * otherwise the window is not valid. */
 	if (switch_win(&oldcurwin, &oldtabpage, win, tp, TRUE) == OK)
 	{
+#ifdef FEAT_AUTOCMD
+	    unblock_autocmds();
+#endif
 	    if (*varname == '&')	/* window-local-option */
 	    {
 		if (get_option_tv(&varname, rettv, 1) == OK)
@@ -12463,6 +12466,9 @@
 		    done = TRUE;
 		}
 	    }
+#ifdef FEAT_AUTOCMD
+	    block_autocmds();
+#endif
 	}
 
 	/* restore previous notion of curwin */
@@ -17622,6 +17628,9 @@
 	if (switch_win(&save_curwin, &save_curtab, win, tp, TRUE) == OK)
 #endif
 	{
+#ifdef FEAT_AUTOCMD
+	    unblock_autocmds();
+#endif
 	    if (*varname == '&')
 	    {
 		long	numval;
@@ -17645,6 +17654,9 @@
 		    vim_free(winvarname);
 		}
 	    }
+#ifdef FEAT_AUTOCMD
+	    block_autocmds();
+#endif
 	}
 #ifdef FEAT_WINDOWS
 	restore_win(save_curwin, save_curtab, TRUE);