patch 9.0.1255: changing 'virtualedit' does not have immediate effect

Problem:    Changing 'virtualedit' does not have immediate effect.
Solution:   Correct how is checked for a changed value. (closes #11878)

src/optionstr.c

@@ -2078,7 +2078,7 @@ did_set_string_option(
 	{
 	    if (opt_strings_flags(ve, p_ve_values, flags, TRUE) != OK)
 		errmsg = e_invalid_argument;
-	    else if (STRCMP(p_ve, oldval) != 0)
+	    else if (STRCMP(ve, oldval) != 0)
 	    {
 		// Recompute cursor position in case the new 've' setting
 		// changes something.

src/testdir/test_virtualedit.vim

@@ -537,6 +537,19 @@ func Test_global_local_virtualedit()
   set virtualedit&
 endfunc
 
+func Test_virtualedit_setlocal()
+  enew
+  setglobal virtualedit=all
+  setlocal virtualedit=all
+  normal! l
+  redraw
+  setlocal virtualedit=none
+  call assert_equal(1, wincol())
+
+  setlocal virtualedit&
+  set virtualedit&
+endfunc
+
 func Test_virtualedit_mouse()
   let save_mouse = &mouse
   set mouse=a

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1255,
 /**/
     1254,
 /**/