ODT Export display issues with tables

When exporting to Office (ODT) the HTML given to Office for the following wiki content:

|= table header |= table header |= table header
| cell | cell | cell
| cell | cell | cell

will contain spaces in each <th> and <td> at the beginning and end of each cell.
The result in Office is the following:

If your wiki content is like that, then you get a nicer display

|=table header|=table header|=table header
|cell|cell|cell
|cell|cell|cell

which becomes even better with a width param:

(% width="100%" %)
|=table header|=table header|=table header
|cell|cell|cell
|cell|cell|cell

So we would need to use an HTMLCleaner which trims the white spaces in cells and also adds a width parameter to the

Note that in XWiki all this displays the same (100%):

It's also unclear why in office the "th" ends up centered while the "td" is left align. The HTML has no difference.