drag speed when using css zoom

We are using css zoom to change the dynamically scale down the size of a group of react controls that includes a sortable and sortable items. When doing so, if we drag a control to sort then it will drag at a slower speed then the mouse.

Start by reproducing the drag behavior described when a group of React controls is scaled with CSS zoom, comparing pointer movement with sortable-item movement. Trace the sortable drag calculations and determine how the zoom factor affects them. Done means dragging remains aligned with the mouse while CSS zoom is applied.

Written by the indexing model from the issue text.