On linux isAbsourd point is incompatible with multiple desktop. Event a point on a desktop could be intended as absould because of the point is checked against the screen position. This leads to a lot of errors when screens are positionned differently than 'standard' position. According to the comment this is used only on mac.

src/board/UBBoardView.cpp

@@ -940,19 +940,21 @@ void UBBoardView::virtualKeyboardActivated(bool b)
 
 // Apple remote desktop sends funny events when the transmission is bad
 
-bool
+bool UBBoardView::isAbsurdPoint(QPoint point)
-UBBoardView::isAbsurdPoint (QPoint point)
 {
+#ifdef Q_WS_MACX
     QDesktopWidget *desktop = qApp->desktop();
     bool isValidPoint = false;
 
-    for (int i = 0; i < desktop->numScreens (); i++)
+    for (int i = 0; i < desktop->numScreens() && !isValidPoint; i++){
-    {
       QRect screenRect = desktop->screenGeometry(i);
+      screenRect=QRect(QPoint(0,0),screenRect.size());
       isValidPoint = isValidPoint || screenRect.contains(point);
     }
-
     return !isValidPoint;
+#else
+    return false;
+#endif
 }
 
 void