When resizing a table, prosemirror changes the colgroup's col widths without transmitting this data to the table nodes. This is related to [this issue](#655). The fix consists of listening to the mouse up event and checking for a change in any of the columns from prosemirror. If there is a change that should affect a cell, we update the cells of the table. This will re-render the table. We persist the width information in a property for the node. Thus we had to change the typing of cell contents.