Doxygen supports <code>

Doxygen supports code so it looked like the view_seq_code was not required but  the double quote has to be escaped.
For the '<pre>'  command the `-` sign at the beginning needs to be escaped otherwise it is seen as the start of a list (it doesn't hurt that the other `-` signs are escaped as well), so we need special handling of verbatim sections.

Author: albert-github

lib/Doxygen/Filter/Perl/POD.pm

@@ -118,6 +118,26 @@ sub view_head4
 }
 
 
+sub view_seq_code
+{
+    my ($self, $text) = @_;
+    $text =~ s/"/\\"/g;
+    return "<code>$text</code>";
+}
+
+
+sub view_verbatim {
+    my ($self, $text) = @_;
+    for ($text) {
+        s/&/&amp;/g;
+        s/</&lt;/g;
+        s/>/&gt;/g;
+        s/-/\\-/g;
+    }
+    return "<pre>$text</pre>\n\n";
+}
+
+
 =head1 NAME
 
 Doxygen::Filter::Perl::POD - A perl code pre-filter for Doxygen