Resize guide not showing last column/row

The width of the guide was calculated between the subtract of innerHeight and outerHeight of a cell component. The subtract could some times be 0, which mean the guide will not show. The solution is to have a minimum width so the guide will always display.
Merge pull request #1034 from najor/hotfix-drag-col-row-last-col-rt55437

Resize guide not showing last column/row