Add cases so selection from right, left in all orientations works

clusterview/opengl_widget.py

@@ -261,6 +261,21 @@ def box_hit(tx, ty, x1, y1, x2, y2):
                 ty <= y1 and
                 ty >= y2)
 
+    # The box in this case started from the top right
+    if x1 > x2 and y1 < y2:
+        return (tx <= x1 and
+                tx >= x2 and
+                ty >= y1 and
+                ty <= y2)
+
+    # The box in this case started from the bottom left
+    if x1 < x2 and y1 > y2:
+        return (tx >= x1 and
+                tx <= x2 and
+                ty <= y1 and
+                ty >= y2)
+
+    # Normal condition: Box starts from the top left
     return (tx >= x1 and
             tx <= x2 and
             ty >= y1 and