Issue Summary

After migrating content from legacy tinyMCE editor to the fabric editor, tables which have been resized that are inside layouts have much larger column widths than expected. 

Steps to Reproduce

1. Create a legacy editor page
2. Add a layout
3. Add a table inside the layout
4. Resize the columns of the table 
5. Autoconvert the page to the fabric editor

Expected Results

The percentage column widths are converted to the correct pixel widths

Actual Results

The column widths retain the right ratio but are much larger. The column widths are calculated as a percentage of the whole page rather than of the layout container. 

Workaround

Change the page to edit mode and update it, as that automatically normalises the column widths to fit within its container.