Resolves incompatibility of listings package with utf8 encoding. Fixes …

…#304

latexdiff

@@ -46,6 +46,7 @@
 #  - File added via --preamble option is no longer assumed to be ASCII, but read either with encoding as defined by --encoding option or using the encoding of the LOCALE (fixes issue #285 )
 #  - multicolumn argument is now treated as text
 #  - when tikz-dependency package is used, \& is no longer a safe command as it has special meaning inside dependency environment.  The fix is a little of a hack as really it should only be considered unsafe within dependency environment (fixes (mostly) issue #303 )
+#  - listings package had trouble with non-ASCII chars. The encoding is now set (thanks to github user anka-213 for finding this). Fixes #304
 #
 # Version 1.3.3:
 # New features:
@@ -924,7 +925,7 @@ if (defined($labels[1])) {
 $encoding=guess_encoding($newfile) unless defined($encoding);
 
 $encoding = "utf8" if $encoding =~ m/^utf8/i ;
-###print STDERR "Encoding $encoding\n" if $verbose;
+print STDERR "Encoding $encoding\n" if $verbose;
 if (lc($encoding) eq "utf8" ) {
   binmode(STDOUT, ":utf8");
   binmode(STDERR, ":utf8");
@@ -1173,7 +1174,7 @@ if ( defined($packages{"listings"}) or `kpsewhich listings.sty` ne "" ) {
   }
   my @listingDIFcode=();
   my $replaced;
-  # note that in case user supplies preamblefile the type might not reflect well the
+  # note that in case user supplies preamblefile the type might not reflect well the actual markup style
   @listingDIFcode=extrapream("-nofail","DIFCODE_" . $type) unless defined($preamblefile);
   if (!(@listingDIFcode)) {
     # if listingDIFcode is empty try to guess a suitable one from the preamble
@@ -1187,6 +1188,10 @@ if ( defined($packages{"listings"}) or `kpsewhich listings.sty` ne "" ) {
       @listingDIFcode=extrapream("DIFCODE_BOLD");
     }
   }
+  # add configuration so that listings work with utf-8
+  push @listingpreamble, '\lstset{extendedchars=\true,inputencoding='.$encoding."}\n";
+
+
   # now splice it in
   $replaced=0;
   ###print STDERR "DEBUG: listingDIFcode: ",join("\n",@listingDIFcode),"|||\n" if $debug;