STRING_LINE_READER::ReadLine() has been broken for a few weeks, since changing...

STRING_LINE_READER::ReadLine() has been broken for a few weeks, since changing the purpose of member 'source'

common/richio.cpp

@@ -131,13 +131,12 @@ unsigned STRING_LINE_READER::ReadLine() throw (IOError)
         if( length >= maxLineLength )
             throw IOError( _("Line length exceeded") );
 
-        if( length+1 > capacity )
+        if( length+1 > capacity )   // +1 for terminating nul
             expandCapacity( length+1 );
 
         wxASSERT( ndx + length <= lines.length() );
 
-        memcpy( line, &source[ndx], length );
-        line[length] = 0;
+        memcpy( line, &lines[ndx], length );
 
         ++lineNum;
         ndx += length;