BUG: avoid_overlapped_widgets and collision wait_for_mouseup false fails

[timothymarois]

Only avoids collation with one box, If you have a larger box and additional boxes, move the larger one over the others and it will only move one out of the way. Avoid overlap doesn't work as expected since the larger one overlaps ontop of the ones that do not move.

Configuration:

                widget_selector: 'li',
                widget_base_dimensions: ['auto', 110],
                autogenerate_stylesheet: true,
                avoid_overlapped_widgets : true,
                min_cols: 1,
                max_cols: 14,
                widget_margins: [5, 5],
                shift_widgets_up: false,
                shift_larger_widgets_down: false,
                move_widgets_down_only: false,
                scroll_container : '.app-main',
                resize: {
                    enabled: true,
                    // axes: 'x'
                },
                collision: {
                    wait_for_mouseup: false
                },

First load it appears to work, but then once you move an item and try again, it now allows overlapping