copy lexer settings from default settings file for new languages * file-editor-tab.cc (update_lexer_settings): call the new member function of the resource manager for loading the current lexer settings instead of the related lexer function directly * resource-manager.cc (get_default_font): move the code for determining the default monospace font and size into a separate function; (reload_settings): call new function for the default font and size; (read_lexer_settings): new member function testing for lexer settings in a given settings file and copy them from the default settings if not available * resource-manager.h: include Qsci/qscilexer.h, new member function get_default_font and read_lexer_settings * settings-dialog.cc (read_lexer_settings): call the new member function of the resource manager for loading the current lexer settings instead of the related lexer function directly

--- a/libgui/src/settings-dialog.cc	Tue Dec 08 11:13:26 2020 -0800
+++ b/libgui/src/settings-dialog.cc	Tue Dec 08 21:34:55 2020 +0100
@@ -664,8 +664,12 @@
                                              gui_settings *settings)
   {
 #if defined (HAVE_QSCINTILLA)
+    resource_manager& rmgr = m_octave_qobj.get_resource_manager ();
 
-    lexer->readSettings (*settings);
+    // Get lexer settings and copy from default settings if not yet
+    // available in normal settings file
+    rmgr.read_lexer_settings (lexer, settings);
+
     int styles[MaxLexerStyles];  // array for saving valid styles
     // (enum is not continuous)
     int max_style = get_valid_lexer_styles (lexer, styles);