Change dragging cursor on Windows

doc/classes/Input.xml

@@ -386,6 +386,7 @@
 		</constant>
 		<constant name="CURSOR_DRAG" value="6" enum="CursorShape">
 			Drag cursor. Usually displayed when dragging something.
+			[b]Note:[/b] Windows lacks a dragging cursor, so [constant CURSOR_DRAG] is the same as [constant CURSOR_MOVE] for this platform.
 		</constant>
 		<constant name="CURSOR_CAN_DROP" value="7" enum="CursorShape">
 			Can drop cursor. Usually displayed when dragging something to indicate that it can be dropped at the current position.

platform/windows/display_server_windows.cpp

@@ -1208,7 +1208,7 @@ void DisplayServerWindows::cursor_set_shape(CursorShape p_shape) {
 		IDC_CROSS,
 		IDC_WAIT,
 		IDC_APPSTARTING,
-		IDC_ARROW,
+		IDC_SIZEALL,
 		IDC_ARROW,
 		IDC_NO,
 		IDC_SIZENS,