Can not render wiki content as inline text using user macros

Using the workaround proposed in CONF-3887 and CONF-2293 to render User-Macro-Body contents there is a problem. Rendering the body will always embed the content into a HTML-paragraph-element (<p>).

Example:

User Macro bgcolor:

-----------------------
#set($color=$param0)
#set($wiki=$body)
#set($globalHelper=$action.getGlobalHelper())
#if($content)
#set($renderer=$globalHelper.getWikiStyleRenderer())
#set($context=$content.toPageContext())
#set($xhtml=$renderer.convertWikiToXHtml($context, $wiki))
#else
#set($xhtml=$globalHelper.renderConfluenceMacro($wiki))
#end
<span style="background-color:${color};">${xhtml}</span>##
--------------------------

Will render the Wiki-content:

{bgcolor:red}Red{bgcolor}

,

{bgcolor:green}Green{bgcolor}

,

{bgcolor:blue}Blue{bgcolor}

to:

<span style="background-color:red;"><p>Red</p></span>
<span style="background-color:green;"><p>Green</p></span>
<span style="background-color:blue;"><p>Blue</p></span>

instead of:

<span style="background-color:red;">Red</span>
<span style="background-color:green;">Green</span>
<span style="background-color:blue;">Blue</span>

If there is no way to just remove the content from beeing embedded into a paragraph-element (for compatibility reasons) there should be at least an additional method with an additional argument like "boolean inline".