provide an editor lexer for text or unknown files (bug #43572) * default-qt-settings.in: fix color for numbers in bash files, add defaults for the new text lexer * file-editor-tab.cc (update_lexer): only select the bash lexer for .sh-files, select the new text lexer for .m-files or unnamed files if octave and matlab lexer is not available as well as for files with no or unknown extension * octave-txt-lexer.h: new lexer class derived from QsciLexer just providing the default style for text or unknown files * octave-txt-lexer.cc (language, description): implemented functions * module.mk: added new files octave-txt-lexer.cc/.h * settings-dialog.cc (constructor): read the settings for the new text lexer; (write-changed-settings): write settings for the new lexer into the files

--- a/libgui/src/settings-dialog.cc	Sat Nov 22 20:19:23 2014 -0800
+++ b/libgui/src/settings-dialog.cc	Sun Nov 23 13:13:35 2014 +0100
@@ -37,6 +37,7 @@
 
 #ifdef HAVE_QSCINTILLA
 #include "octave-qscintilla.h"
+#include "octave-txt-lexer.h"
 #include <QScrollArea>
 
 #if defined (HAVE_QSCI_QSCILEXEROCTAVE_H)
@@ -358,6 +359,9 @@
   lexer = new QsciLexerBash ();
   read_lexer_settings (lexer,settings);
   delete lexer;
+  lexer = new octave_txt_lexer ();
+  read_lexer_settings (lexer,settings);
+  delete lexer;
 #endif
 
   // which tab is the desired one?
@@ -757,6 +761,9 @@
   lexer = new QsciLexerBash ();
   write_lexer_settings (lexer,settings);
   delete lexer;
+  lexer = new octave_txt_lexer ();
+  write_lexer_settings (lexer,settings);
+  delete lexer;
 #endif
 
   // Workspace