Bug 308709: Misleading confirmation when entering an invalid sort key for a field value

Bugzilla/Field/Choice.pm

@@ -256,7 +256,7 @@ sub _check_sortkey {
     return 0 if !$value;
     # Store for the error message in case detaint_natural clears it.
     my $orig_value = $value;
-    detaint_natural($value)
+    (detaint_natural($value) && $value <= MAX_SMALLINT)
         || ThrowUserError('fieldvalue_sortkey_invalid',
                           { sortkey => $orig_value,
                             field   => $invocant->field });

template/en/default/global/user-error.html.tmpl

@@ -578,8 +578,8 @@
   [% ELSIF error == "fieldvalue_sortkey_invalid" %]
     [% title = "Invalid Field Value Sortkey" %]
     The sortkey '[% sortkey FILTER html %]' for the
-    [%+ field.description FILTER html %] field is not a valid 
-    (positive) number.
+    [%+ field.description FILTER html %] field must be an integer
+    between 0 and [% constants.MAX_SMALLINT FILTER none %].
 
   [% ELSIF error == "fieldvalue_still_has_bugs" %]
     [% title = "You Cannot Delete This Field Value" %]