The direction you drag the block and the point you grab it seem to be factors:
If you grab from the left side and drag the block to the left, it will trigger the dropdown. However, if you grab from the left and drag to the right, it won't. Same for the right side: dragging to the right will trigger the dropdown.
« Last Edit: April 15, 2016, 11:38:19 pm by Irock »