TinyMCE editor for HTML textareas (except description)

Textareas with HTML enabled - except the description field - should be
editable with a (simple) rich text editor. This allows also users
without HTML skills to create formatted text. The description field is
excluded to ensure a working layout with this common field.

These are just some quick changes working well for our use cases.
Probably there's a more elegant implementation possible.

assets/css/um-styles.css

@@ -428,6 +428,16 @@ p.um-notice.warning {
 	outline: none !important;
 }
 
+.um-form .wp-editor-container {
+	border: 1px solid #ddd;
+}
+
+.um-form .wp-editor-container textarea {
+	background: #ddd !important;
+	color: #222 !important;
+	border-radius: 0;
+}
+
 /*
 	- Radio & Checkboxes
 */

core/um-fields.php

@@ -1215,8 +1215,33 @@ class UM_Fields {
 						
 						$output .= '<div class="um-field-area">';
 
-						$output .= '<textarea style="height: '.$height.';" class="'.$this->get_class($key, $data).'" name="'.$key.'" id="'.$key.'" placeholder="'.$placeholder.'">'.$this->field_value( $key, $default, $data ).'</textarea>
-							
+						if ( isset( $data['html'] ) && $data['html'] != 0 && $key != "description" ) {
+						
+
+							$textarea_settings = array( 
+								'media_buttons' => false, 
+								'wpautop' => false, 
+								'editor_class' => $this->get_class($key, $data),
+								'editor_height' => $height,
+								'tinymce'=> array(
+									'toolbar1' => 'formatselect,bullist,numlist,bold,italic,underline,forecolor,blockquote,hr,removeformat,link,unlink,undo,redo',
+									'toolbar2' => ''
+								) 
+							);
+						
+							// turn on the output buffer
+							ob_start();
+						
+							// echo the editor to the buffer
+							wp_editor( $this->field_value( $key, $default, $data ) , $key, $textarea_settings );
+						
+							// add the contents of the buffer to the output variable
+							$output .=  ob_get_clean();
+						
+						}
+						else $output .= '<textarea style="height: '.$height.';" class="'.$this->get_class($key, $data).'" name="'.$key.'" id="'.$key.'" placeholder="'.$placeholder.'">'.$this->field_value( $key, $default, $data ).'</textarea>';
+
+						$output .= '							
 						</div>';
 							
 						if ( $this->is_error($key) ) {