<%perl>
if ( ref $Message ) {
$m->out('<pre>') if $plain_text_pre && !$Depth && !$plain_text_mono;
- $m->out( qq{<div class="message-stanza-depth-$Depth">} );
+ $m->out( qq{<div class="message-stanza-depth-$Depth } .($plain_text_mono ? "plain-text-white-space" : "") .qq{">} );
+
my @stack;
my $para = '';