14.31: drag events built for Qt 6.12 and 6.4 alike

tests/DragAt.h

@@ -0,0 +1,7 @@
+#pragma once
+#include <QDragMoveEvent>
+#include <type_traits>
+
+// Qt 6.12 takes a drag point as QPointF; 6.4, QPoint.
+using DragAt = std::conditional_t<std::is_constructible_v<QDragMoveEvent, QPointF, Qt::DropActions, const QMimeData *, Qt::MouseButtons, Qt::KeyboardModifiers>,
+                                  QPointF, QPoint>;