add test for repeatable with form clone method

lib/HTML/FormHandler/BuildFields.pm

@@ -189,8 +189,8 @@ sub _make_field {
 sub _make_adhoc_field {
     my ( $self, $class, $field_attr ) = @_;
 
-    # remove and save form & parent, because sometimes hash cloning creates
-    # a new reference
+    # remove and save form & parent, because if the form class has a 'clone'
+    # method, Data::Clone::clone will clone the form
     my $parent = delete $field_attr->{parent};
     my $form = delete $field_attr->{form};
     $field_attr = $self->_merge_updates( $field_attr, $class );

xt/repeatable_clone.t

@@ -0,0 +1,59 @@
+use strict;
+use warnings;
+use Test::More;
+
+# tests that we have a valid form reference after
+#  merging attributes for a repeatable instance and a
+# form package with a 'clone' method
+{
+    package MyApp::Form::Rep;
+    use HTML::FormHandler::Moose;
+    extends 'HTML::FormHandler';
+
+    use Clone ('clone');
+
+    has '+name' => ( default => 'testform' );
+    has_field 'foo';
+    has_field 'my_array' => ( type => 'Repeatable' );
+    has_field 'my_array.one';
+    has_field 'my_array.two' => ( type => 'Select' );
+    has_field 'my_array.three';
+
+    sub build_update_subfields {
+        { all => { wrap_label_method => \&wrap_label } }
+    }
+
+    sub wrap_label {
+        my $self = shift; # field
+        my $label = $self->label;
+        return qq{<a href="/some/link">$label</a>};
+    }
+
+    sub default_my_array {
+        my $self = shift;
+        return (
+            { one => 'abc1', two => 2, three => 'abc3' },
+            { one => 'def1', two => 3, three => 'def3' },
+            { one => 'ghi1', two => 1, three => 'ghi3' }
+        );
+    }
+    sub options_my_array_two {
+       return (
+           1   => 'one',
+           2   => 'two',
+           3   => 'three',
+       );
+    }
+    # this won't take effect; the 'my_array' default has precedence
+    # would be used for 'num_extra'
+    sub default_my_array_three { 'default_three' }
+}
+
+my $form = MyApp::Form::Rep->new;
+ok( $form );
+$form->process;
+is( $form->field('my_array.0')->has_form, 1, 'has_form is true' );
+ok( $form->field('my_array.0')->form, 'actually has form object' );
+ok( $form == $form->field('my_array.0')->form, 'correct form object' );
+
+done_testing;