Fixes #7910: Check for double form names

extension/Source/sql/formEditor.sql

@@ -185,10 +185,15 @@ INSERT INTO FormElement (formId, name, label, mode, type, checkType, class, ord,
                          checkPattern)
 VALUES
   # Make the form a 'delete form' for records Form/FormElement.
-  (1, 'Delete FE', '', 'show', 'beforeDelete', 'all', 'action', 10, 0, 0, '', '', '', '',
+  (1, '', 'Delete FE', 'show', 'beforeDelete', 'all', 'action', 10, 0, 0, '', '', '', '',
    'sqlAfter={{DELETE FROM FormElement WHERE formId={{id:R}} }}',
    0, '', '', '', 'none', 'no', ''),
 
+  # Check for double form name
+  (1, '', 'Check for double form name', 'show', 'beforeSave', 'all', 'action', 20, 0, 0, '', '', '', '',
+   'sqlValidate={{!SELECT f.id FROM Form AS f WHERE  f.name!="" AND f.name="{{name:F:alnumx}}" AND f.id!={{id:R0}}  }}\nexpectRecords=0\nmessageFail=There is already another form with the name "{{name:F:alnumx}}".',
+   0, '', '', '', 'none', 'no', ''),
+
   # Basic
   (1, 'name', 'Name', 'required', 'text', 'pattern', 'native', 110, 0, 0,
    '<a href="{{documentation:Y}}#form-name">Info</a>', '', '', '', 'autofocus',