Possibility to remove filters individually when using the searchtools…

… layout helper

Bring up a 'removedFilters' (array) option to the 'searchtools layout helper' that allows to remove/disable filters individually.

# Testing

To test it you can change the file:
administrator/components/com_content/views/articles/tmpl/default.php
on line 48:
echo JLayoutHelper::render('joomla.searchtools.default', array('view' => $this));
by: 
echo JLayoutHelper::render('joomla.searchtools.default', array(
        'view' => $this,
        'options' => array(
                'removedFilters' => array()
	)
)); 

Then, add one or more searchtools field name to the 'removedFilters' option array :
        'options' => array(
                'removedFilters' => array('filter_published', 'filter_category_id')
	)

and observe the result (filters removed) on the searchtools bar of:
/administrator/index.php?option=com_content&view=articles

layouts/joomla/searchtools/default/filters.php

@@ -13,13 +13,26 @@
 
 // Load the form filters
 $filters = $data['view']->filterForm->getGroup('filter');
+
+// Remove the search filter
+unset($filters['filter_search']);
+
+// Introduced 'removedFilters' (array) option that lets remove filters
+if (isset($data['options']['removedFilters']))
+{
+    foreach ($data['options']['removedFilters'] as $removedFilters){
+        if (isset($filters[$removedFilters]))
+        {
+            unset($filters[$removedFilters]);
+        }
+    }
+}
+
 ?>
 <?php if ($filters) : ?>
 	<?php foreach ($filters as $fieldName => $field) : ?>
-		<?php if ($fieldName != 'filter_search') : ?>
 			<div class="js-stools-field-filter">
 				<?php echo $field->input; ?>
 			</div>
-		<?php endif; ?>
 	<?php endforeach; ?>
 <?php endif; ?>