Spaces missing in Greek text in listings

Question

I have the following xelatex document:

\documentclass{article}

\usepackage[cm-default]{fontspec}
\setromanfont{FreeSerif}
\setsansfont{FreeSans}
\setmonofont{FreeMono}
\setmainfont{FreeSans}

\usepackage{polyglossia}
\setmainlanguage{greek}
\setotherlanguage{english}

\usepackage{listings}
\lstset{
   basicstyle=\fontsize{11}{13}\selectfont\ttfamily
}

\usepackage[utf8]{inputenc}

\begin{document}

  Αρχικοποίηση του SESSION ώστε να 
  
  Initializing of the SESSION so 

\begin{lstlisting}[caption=protected.php,frame=tlrb]{Name}
<?php
  session_start(); # Αρχικοποίηση του SESSION ώστε να 
  session_start(); # Initializing of the SESSION so  

\end{lstlisting}
\end{document}

But the problem is that the Greek text in the code listing appears with the spaces missing. The text outside the code listing appears with correct spacing:

How can I fix the text in the listing so the spaces appear normally?

Answer 1

See, for instance, https://tex.stackexchange.com/a/25396/4427

You need to add the Greek block U+0370–U+03FF. Possibly also Greek Extended U+1F00–U+1FFF.

\documentclass{article}

\usepackage[a4paper]{geometry}

\usepackage{fontspec}
\usepackage{polyglossia}
\usepackage{listings}

\setmainfont{FreeSans}
\setsansfont{FreeSans}
\setmonofont{FreeMono}

\setmainlanguage{greek}
\setotherlanguage{english}

\lstset{
   basicstyle=\fontsize{11}{13}\ttfamily,
   extendedchars=true,
}

\makeatletter
\lst@InputCatcodes
\def\lst@DefEC{%
 \lst@CCECUse \lst@ProcessLetter
  ^^80^^81^^82^^83^^84^^85^^86^^87^^88^^89^^8a^^8b^^8c^^8d^^8e^^8f%
  ^^90^^91^^92^^93^^94^^95^^96^^97^^98^^99^^9a^^9b^^9c^^9d^^9e^^9f%
  ^^a0^^a1^^a2^^a3^^a4^^a5^^a6^^a7^^a8^^a9^^aa^^ab^^ac^^ad^^ae^^af%
  ^^b0^^b1^^b2^^b3^^b4^^b5^^b6^^b7^^b8^^b9^^ba^^bb^^bc^^bd^^be^^bf%
  ^^c0^^c1^^c2^^c3^^c4^^c5^^c6^^c7^^c8^^c9^^ca^^cb^^cc^^cd^^ce^^cf%
  ^^d0^^d1^^d2^^d3^^d4^^d5^^d6^^d7^^d8^^d9^^da^^db^^dc^^dd^^de^^df%
  ^^e0^^e1^^e2^^e3^^e4^^e5^^e6^^e7^^e8^^e9^^ea^^eb^^ec^^ed^^ee^^ef%
  ^^f0^^f1^^f2^^f3^^f4^^f5^^f6^^f7^^f8^^f9^^fa^^fb^^fc^^fd^^fe^^ff%
  % add Greek
  ^^^^0370^^^^0371^^^^0372^^^^0373^^^^0374^^^^0375^^^^0376^^^^0377%
  ^^^^0378^^^^0379^^^^037a^^^^037b^^^^037c^^^^037d^^^^037e^^^^037f%
  ^^^^0380^^^^0381^^^^0382^^^^0383^^^^0384^^^^0385^^^^0386^^^^0387%
  ^^^^0388^^^^0389^^^^038a^^^^038b^^^^038c^^^^038d^^^^038e^^^^038f%
  ^^^^0390^^^^0391^^^^0392^^^^0393^^^^0394^^^^0395^^^^0396^^^^0397%
  ^^^^0398^^^^0399^^^^039a^^^^039b^^^^039c^^^^039d^^^^039e^^^^039f%
  ^^^^03a0^^^^03a1^^^^03a2^^^^03a3^^^^03a4^^^^03a5^^^^03a6^^^^03a7%
  ^^^^03a8^^^^03a9^^^^03aa^^^^03ab^^^^03ac^^^^03ad^^^^03ae^^^^03af%
  ^^^^03b0^^^^03b1^^^^03b2^^^^03b3^^^^03b4^^^^03b5^^^^03b6^^^^03b7%
  ^^^^03b8^^^^03b9^^^^03ba^^^^03bb^^^^03bc^^^^03bd^^^^03be^^^^03bf%
  ^^^^03c0^^^^03c1^^^^03c2^^^^03c3^^^^03c4^^^^03c5^^^^03c6^^^^03c7%
  ^^^^03c8^^^^03c9^^^^03ca^^^^03cb^^^^03cc^^^^03cd^^^^03ce^^^^03cf%
  ^^^^03d0^^^^03d1^^^^03d2^^^^03d3^^^^03d4^^^^03d5^^^^03d6^^^^03d7%
  ^^^^03d8^^^^03d9^^^^03da^^^^03db^^^^03dc^^^^03dd^^^^03de^^^^03df%
  ^^^^03e0^^^^03e1^^^^03e2^^^^03e3^^^^03e4^^^^03e5^^^^03e6^^^^03e7%
  ^^^^03e8^^^^03e9^^^^03ea^^^^03eb^^^^03ec^^^^03ed^^^^03ee^^^^03ef%
  ^^^^03f0^^^^03f1^^^^03f2^^^^03f3^^^^03f4^^^^03f5^^^^03f6^^^^03f7%
  ^^^^03f8^^^^03f9^^^^03fa^^^^03fb^^^^03fc^^^^03fd^^^^03fe^^^^03ff%
  % the end
  ^^00}
\lst@RestoreCatcodes
\makeatother


\begin{document}

  Αρχικοποίηση του SESSION ώστε να 
  
  Initializing of the SESSION so 

\begin{lstlisting}[caption=protected.php,frame=tlrb]{Name}
<?php
  session_start(); # Αρχικοποίηση του SESSION ώστε να 
  session_start(); # Initializing of the SESSION so  

\end{lstlisting}

\end{document}

I used geometry in order to avoid overfull lines.