Here's the code that's supposed to use a custom setting for the tag Tpl:
public function getTagListerCall($placeholderPrefix = '') {
$settings = $this->getContainerSettings();
$output = '[[tagLister?
&tpl=`'.$this->xpdo->getOption('tplTagRow',$settings,'tag').'`
&tv=`articlestags`
&parents=`'.$this->get('id').'`
&tvDelimiter=`,`
&useTagFurl=`'.$this->xpdo->getOption('friendly_urls', null, false). '`
&limit=`'.$this->xpdo->getOption('tagsLimit',$settings,10).'`
&cls=`'.$this->xpdo->getOption('tagsCls',$settings,'tl-tag').'`
&altCls=`'.$this->xpdo->getOption('tagsAltCls',$settings,'tl-tag-alt').'`
&target=`'.$this->get('id').'`
]]';
$this->xpdo->setPlaceholder($placeholderPrefix.'tags',$output);
return $output;
}
The getOption() call gets the TplTagRow from the settings. Via setPlaceholder, the whole taglister tag replaces the
[[+tags]] placeholder with the tpl property set to the name of the custom tag chunk.
The default chunk is in core/components/taglister/elements/chunks/tag.chunk.tpl. It's not in the Elements tree as far as I can tell.
The default chunk is:
<li class="[[+cls]]"><a href="[[+url]]">[[+tag]]</a> ([[+count]])</li>
Here's what I'd suggest trying. Create a chunk called myTagRowTpl with this code:
<li class="[[+cls]]"><a href="[[+url]]">[[+tag]]</a> XXX ([[+count]])</li>
Put myTagRowTpl in that advanced setting (in place of "tag"). Clear the site cache (you may also need to clear your browser cache). See if XXX shows up in the tag listing. If it doesn't, that setting is truly ignored. If it does, it's used, and you can modify myTagRowTpl to fit your needs.