gui: Add indent/unindent edit menu to editor (Bug #41223) * libgui/src/m-editor/file-editor.h (file_editor::private): Add _indent_selection_action, _unindent_selection_action menus. (file_editor::request_indent_selected_text): New function. (file_editor::request_indent_selected_text): New function. (file_editor::fetab_indent_selected_text): New signal. (file_editor::fetab_indent_selected_text): New signal. * libgui/src/m-editor/file-editor.cc (file_editor::request_indent_selected_text): New function. (file_editor::request_unindent_selected_text): New function. (file_editor::contruct: Create indent menus and connect signals. (file_editor::set_shortcuts): Enable/disable indent menus and shortcuts. (file_editor::check_actions): Enable indent menus if have editor tabs. * libgui/src/m-editor/file-editor-tab.h (file-editor-tab::indent_selected_text): New function. (file-editor-tab::unindent_selected_text): New function. (file-editor-tab::do_indent_selected_text): New function. * libgui/src/m-editor/file-editor-tab.cc (file-editor-tab::indent_selected_text): New function. (file-editor-tab::unindent_selected_text): New function. (file-editor-tab::do_indent_selected_text): New function.

--- a/libgui/src/m-editor/file-editor-tab.h	Sat Jan 18 09:25:33 2014 +0100
+++ b/libgui/src/m-editor/file-editor-tab.h	Sat Jan 18 08:50:03 2014 -0500
@@ -93,6 +93,10 @@
 
   void comment_selected_text (const QWidget *ID);
   void uncomment_selected_text (const QWidget *ID);
+
+  void indent_selected_text (const QWidget *ID);
+  void unindent_selected_text (const QWidget *ID);
+
   void find (const QWidget *ID);
   void goto_line (const QWidget *ID, int line = -1);
 
@@ -186,6 +190,7 @@
   int check_file_modified ();
   void do_comment_selected_text (bool comment);
   QString comment_string (const QString&);
+  void do_indent_selected_text (bool indent);
 
   void add_breakpoint_callback (const bp_info& info);
   void remove_breakpoint_callback (const bp_info& info);