A bold starting with a space at the beginning of the line in the XDOM will be lost by XWiki renderer

This is because

 **<space><space>toto

is a list in XWiki 2.0 syntax.

A fix would be for the XWiki renderer to render

 **{{{<space>}}}<space>toto

or if it too disturbing for user simple remove all the first spaces of the bold block when rendering.