fixed: DataForm will create fields with duplicate names but doesn't use them separately

docs/changelog/7.x.x.txt

@@ -15,6 +15,7 @@
  - fixed: Collaboration System threads can return other object types when asked for replies
  - fixed: Able to cut or trash system assets
  - fixed: Can't purge uncommitted assets if not using its version tag
+ - fixed: DataForm will create fields with duplicate names but doesn't use them separately
 
 7.5.7
  - fixed: HttpProxy mixes original site's content encoding with WebGUI's

lib/WebGUI/Asset/Wobject/DataForm.pm

@@ -1068,6 +1068,13 @@ sub www_editFieldSave {
 	my $name = $self->session->url->urlize($form->process("name") || $form->process("label"));
         $name =~ s/\-//g;
         $name =~ s/\///g;
+    my $exists = 1;
+    while ($exists) {
+        $exists = $self->session->db->quickScalar('SELECT DataForm_fieldId FROM DataForm_field WHERE assetId=? AND name=?', [$self->getId, $name]);
+        if ($exists) {
+            $name =~ s/(\d+|)$/$1 + 1/e; # increment number at the end of the name
+        }
+    }
 	$self->setCollateral("DataForm_field","DataForm_fieldId",{
 		DataForm_fieldId=>$form->process("fid"),
 		width=>$form->process("width", 'integer'),