patch 8.2.2519: Vim9: no reason to keep strange Vi behavior

Problem:    Vim9: no reason to keep strange Vi behavior.
Solution:   ":3" and ":3|" both go to line 3. ":|" does not print the line.
            (closes #7840)

src/ex_docmd.c

@@ -1957,12 +1957,16 @@ do_one_cmd(
 	/*
 	 * strange vi behaviour:
 	 * ":3"		jumps to line 3
-	 * ":3|..."	prints line 3
+	 * ":3|..."	prints line 3  (not in Vim9 script)
-	 * ":|"		prints current line
+	 * ":|"		prints current line  (not in Vim9 script)
 	 */
 	if (ea.skip)	    // skip this if inside :if
 	    goto doend;
-	if (*ea.cmd == '|' || (exmode_active && ea.line1 != ea.line2))
+	if ((*ea.cmd == '|' || (exmode_active && ea.line1 != ea.line2))
+#ifdef FEAT_EVAL
+		&& !vim9script
+#endif
+	   )
 	{
 	    ea.cmdidx = CMD_print;
 	    ea.argt = EX_RANGE+EX_COUNT+EX_TRLBAR;

src/testdir/test_vim9_script.vim

@@ -22,6 +22,17 @@ def Test_range_only()
   :3
   list
   assert_equal('three$', Screenline(&lines))
+
+  # missing command does not print the line
+  var lines =<< trim END
+    vim9script
+    :1|
+    assert_equal('three$', Screenline(&lines))
+    :|
+    assert_equal('three$', Screenline(&lines))
+  END
+  CheckScriptSuccess(lines)
+
   bwipe!
 
   # won't generate anything

src/version.c

@@ -750,6 +750,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2519,
 /**/
     2518,
 /**/