patch 8.2.2281: Vim9: compiled "wincmd" cannot be followed by bar

Problem:    Vim9: compiled "wincmd" cannot be followed by bar.
Solution:   Check for bar after "wincmd". (closes #7599)

src/testdir/test_vim9_cmd.vim

@@ -868,4 +868,14 @@ def Test_insert_complete()
   bwipe!
 enddef
 
+def Test_wincmd()
+  split
+  var id1 = win_getid()
+  if true
+    try | wincmd w | catch | endtry
+  endif
+  assert_notequal(id1, win_getid())
+  close
+enddef
+
 " vim: ts=8 sw=2 sts=2 expandtab tw=80 fdm=marker

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2281,
 /**/
     2280,
 /**/

src/vim9compile.c

@@ -7329,6 +7329,20 @@ compile_exec(char_u *line, exarg_T *eap, cctx_T *cctx)
 	    if (eap->nextcmd != NULL)
 		nextcmd = eap->nextcmd;
 	}
+	else if (eap->cmdidx == CMD_wincmd)
+	{
+	    p = eap->arg;
+	    if (*p != NUL)
+		++p;
+	    if (*p == 'g' || *p == Ctrl_G)
+		++p;
+	    p = skipwhite(p);
+	    if (*p == '|')
+	    {
+		*p = NUL;
+		nextcmd = p + 1;
+	    }
+	}
     }
 
     if (eap->cmdidx == CMD_syntax && STRNCMP(eap->arg, "include ", 8) == 0)