1.10.3 sortable works very erratically with flexbox content

1.10.3 sortable works very erratically with flexbox content

Please try it out in Chrome or Firefox beta, soon to be in stable:


Dragging a layer up or down works about half of the time for me. I have no idea what the problem is.

Being able to use flexbox and sortable together for reversed, start-at-the-bottom layout patterns is crucial for UI widgets like a layers panel. (This is not an edge case.)