Copy formatting to apply to multiple table cells

Step to reproduce:

• Create a new clean XWiki 17.10.3 instance.
• Open the admin section "WYSIWYG Editor"
• In the "Disabled Toolbar Features" section, remove the element "CopyFormatting" from the list.
• Save
• Create a new page with table with 2 rows and 2 lines.
• Set the background color to any color for the first line.
• Select the first line and click on "Copy formatting" and apply the formatting on the second line.

Expected

The whole second line have the same color, the same than the first one

Currently

Only the first cell have the formatting applied.