- /* Failing that, try to open a new sub column below the nearest
- * predecessor window that thrones over enough empty space.
+ /* Failing that, try to fit the top left corner to the top right corner
+ * of the last predecessor w_test 1) not followed by top windows or any
+ * other windows with a left corner further rightwards than its own left
+ * corner 2) with enough space rightwards for w until the bottom right
+ * corner of w_thro directly throning over it 3) and with this same
+ * space extending for enough to the bottom for fitting in w.