Todo/Done menu mark all in this column

Template/board/mark_all_item.php

@@ -0,0 +1,19 @@
+<?php
+/**
+ * "Mark all as Done/Todo" entry in the board column header dropdown. Like the "Remove this Column"
+ * item, the column hook renders outside the native menu <ul>, so this is hidden and moved into the
+ * menu by Asset/js/relocate.js. Shown only on non-empty columns to users who may modify tasks.
+ * Clicking opens a modal (DoneController::confirmColumn) that both confirms and picks the direction.
+ */
+if ($column['nb_tasks'] <= 0 || ! $this->user->hasProjectAccess('TaskModificationController', 'update', $column['project_id'])) {
+    return;
+}
+?>
+<li class="organontweaks-markall-item" style="display: none;">
+    <?= $this->modal->medium('check-square-o', t('Mark all as Done/Todo'), 'DoneController', 'confirmColumn', array(
+        'plugin' => 'OrganonTweaks',
+        'project_id' => $column['project_id'],
+        'column_id' => $column['id'],
+        'swimlane_id' => $swimlane['id'],
+    )) ?>
+</li>