Summary of Changes

Fixed OptionsRule validation to support groupedlist fields by iterating through <group> children to find nested options.

Testing Instructions

Create a groupedlist field with validate="options", submit with valid value, and verify validation passes.

Steps to Test

1. Create a test plugin with a groupedlist field:
   • Go to System → Plugins → Create a test plugin XML file with this field definition:

<field
    name="test_grouped"
    type="groupedlist"
    label="Test Grouped Field"
    validate="options"
>
    <option value="">Select Option</option>
    <group label="Group 1">
        <option value="option1">Option 1</option>
        <option value="option2">Option 2</option>
    </group>
    <group label="Group 2">
        <option value="option3">Option 3</option>
        <option value="option4">Option 4</option>
    </group>
</field>

2. Test the validation:

   • Open the plugin configuration
   • Select a valid option from any group (e.g., "Option 2" or "Option 3")
   • Click Save

3. Verify the result:

   • BEFORE this PR: You would get "Invalid field: test_grouped" error
   • AFTER this PR: The field saves successfully without validation errors

Actual result BEFORE applying this Pull Request

Validation fails with "Invalid field" error even when selecting valid grouped options because OptionsRule only checked direct <option> children and ignored options nested inside <group> elements.

Expected result AFTER applying this Pull Request

Validation passes for valid options within any group. The rule now correctly iterates through both direct options and options nested within group elements.

Link to documentations

• No documentation changes for docs.joomla.org needed
• No documentation changes for manual.joomla.org needed