>>504, 505, 506
'contextmenu': addMenu,
     ↓
// 'contextmenu': addMenu,

$('#MapContentWrap').on('contextmenu', function () {
mouseDown();
addMenu(event);
return false;
});
     ↓
$('#MapContentWrap').on('contextmenu', function (event) {
if (event.target.id == 'unit_click_area') {
mouseDown();
addMenu(event);
return false;
}
});