Accessible Tags autocomplete:

- Replace suggest.js with UI Autocomplete.
- Use the same settings like in the editor link toolbar.
- Abstract it and add in a new file, tags-suggest.js. Then make it a dependency for the Tags postbox(es) and Quick and Bulk Edit.
- Add `data-wp-taxonomy` on all input elements to improve handling in the UI for custom taxonomies.

Props afercia, azaozz.
See #33902.
Built from https://develop.svn.wordpress.org/trunk@38797


git-svn-id: http://core.svn.wordpress.org/trunk@38740 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/class-wp-posts-list-table.php

@@ -1550,10 +1550,13 @@ class WP_Posts_List_Table extends WP_List_Table {
 	<?php if ( count( $flat_taxonomies ) && !$bulk ) : ?>
 
 	<?php foreach ( $flat_taxonomies as $taxonomy ) : ?>
-		<?php if ( current_user_can( $taxonomy->cap->assign_terms ) ) : ?>
+		<?php if ( current_user_can( $taxonomy->cap->assign_terms ) ) :
+			$taxonomy_name = esc_attr( $taxonomy->name );
+	
+			?>
 			<label class="inline-edit-tags">
 				<span class="title"><?php echo esc_html( $taxonomy->labels->name ) ?></span>
-				<textarea cols="22" rows="1" name="tax_input[<?php echo esc_attr( $taxonomy->name )?>]" class="tax_input_<?php echo esc_attr( $taxonomy->name )?>"></textarea>
+				<textarea data-wp-taxonomy="<?php echo $taxonomy_name; ?>" cols="22" rows="1" name="tax_input[<?php echo $taxonomy_name; ?>]" class="tax_input_<?php echo $taxonomy_name; ?>"></textarea>
 			</label>
 		<?php endif; ?>