patch 9.1.0800: tests: no error check when setting global 'termwinsize'

Problem:  tests: no error check when setting global 'termwinsize'
Solution: Also validate when using setglobal (Milly).

closes: #15918

Signed-off-by: Milly <milly.ca@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

Author: Milly

src/optionstr.c

@@ -3904,17 +3904,16 @@ did_set_termwinkey(optset_T *args UNUSED)
  * The 'termwinsize' option is changed.
  */
     char *
-did_set_termwinsize(optset_T *args UNUSED)
+did_set_termwinsize(optset_T *args)
 {
+    char_u	**varp = (char_u **)args->os_varp;
     char_u	*p;
 
-    if (*curwin->w_p_tws == NUL)
+    if ((*varp)[0] == NUL)
 	return NULL;
 
-    p = skipdigits(curwin->w_p_tws);
-    if (p == curwin->w_p_tws
-	    || (*p != 'x' && *p != '*')
-	    || *skipdigits(p + 1) != NUL)
+    p = skipdigits(*varp);
+    if (p == *varp || (*p != 'x' && *p != '*') || *skipdigits(p + 1) != NUL)
 	return e_invalid_argument;
 
     return NULL;

src/testdir/gen_opt_test.vim

@@ -57,7 +57,6 @@ let skip_setglobal_reasons = #{
       \ sidescrolloff:	'TODO: fix missing error handling for setglobal',
       \ tabstop:	'TODO: fix missing error handling for setglobal',
       \ termwinkey:	'TODO: fix missing error handling for setglobal',
-      \ termwinsize:	'TODO: fix missing error handling for setglobal',
       \ textwidth:	'TODO: fix missing error handling for setglobal',
       \}
 

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    800,
 /**/
     799,
 /**/