ask for saving modified editor files if octave is closed (bug #38689) * files-editor-tab.cc(constrctor): init new flag indicating if app is closing, (check_file_modified): message box is modal if app is closing, no cancel, parent of box is the editor's tab widget for a correct palcement of the box, (conditional_close): new second arg: flag for closing app (default false), it is stored in the tab's class wide flag * file-editor-tab.h: second arg for conditional_close and new class wide flag * file-editor.cc(destructor): sending close requests to all editor tabs with flag indicating the application is closing (add_file_editor_tab): new arg for fetab_close_request and conditional_close * file-editor.h: new 2nd arg for fetab_close_request (closing app, def. false) * main-window.cc(destructor): delete editor window first for showing the message boxes for modified editor files in front of a complete gui

--- a/libgui/src/main-window.cc	Sat May 11 14:01:15 2013 +0200
+++ b/libgui/src/main-window.cc	Sat May 11 18:20:31 2013 +0200
@@ -87,9 +87,9 @@
   // Destroy the terminal first so that STDERR stream is redirected back
   // to its original pipe to capture error messages at exit.
 
+  delete editor_window;     // first one for dialogs of modified editor-tabs
   delete command_window;
   delete workspace_window;
-  delete editor_window;
   delete doc_browser_window;
   delete file_browser_window;
   delete history_window;