Bug 297553: Enable serverpush for Opera

buglist.cgi

@@ -109,11 +109,12 @@ my $format = $template->get_format("list/list", scalar $cgi->param('format'),
 # http://www.browsercaps.org used as source of compatible browsers.
 # Safari (WebKit) does not support it, despite a UA that says otherwise (bug 188712)
 # MSIE 5+ supports it on Mac (but not on Windows) (bug 190370)
+# Opera supports it.
 #
 my $serverpush =
   $format->{'extension'} eq "html"
     && exists $ENV{'HTTP_USER_AGENT'} 
-      && $ENV{'HTTP_USER_AGENT'} =~ /Mozilla.[3-9]/ 
+      && $ENV{'HTTP_USER_AGENT'} =~ /(Mozilla.[3-9]|Opera)/
         && (($ENV{'HTTP_USER_AGENT'} !~ /[Cc]ompatible/) || ($ENV{'HTTP_USER_AGENT'} =~ /MSIE 5.*Mac_PowerPC/))
           && $ENV{'HTTP_USER_AGENT'} !~ /WebKit/
             && !defined($cgi->param('serverpush'))