Gui support for enhancement of dbstop. * octave-qscintilla.cc (contextMenuEvent): Capture right-click in the left margins to show a context menu for "dbstop if...". * octave-qscintilla.{cc,h} (contextmenu_break_condition): new function * file-editor-interface.h: pass condition to handle_update_breakpoint_marker_request * file-editor-tab.{cc,h}: (file_editor_tab, bp_info, handle_request_add_breakpoint, next_breakpoint, previous_breakpoint, do_breakpoint_marker, add_breakpoint_callback): Allow conditional breakpoint markers * file-editor-tab.cc (handle_context_menu_break_condition): new function * file-editor.{cc,h} (request_open_file, add_file_editor_tab, handle_delete_debugger_pointer_request): pass bp conditions. * marker.{cc,h} (marker, construct, handle_report_editor_linenr): pass breakpoint conditions * main-window.{cc,h} (handle_update_breakpoint_marker_request): pass breakpoint condition. * octave-link.h (update_breakpoint): pass breakpoint condition. * octave-qt-link.{cc,h} (do_update_breakpoint): pass breakpoint condition.

--- a/libgui/src/octave-qt-link.h	Sun Jan 24 11:02:30 2016 +1100
+++ b/libgui/src/octave-qt-link.h	Sat Jan 30 10:13:34 2016 +1100
@@ -124,7 +124,8 @@
   void do_execute_in_debugger_event (const std::string& file, int line);
   void do_exit_debugger_event (void);
 
-  void do_update_breakpoint (bool insert, const std::string& file, int line);
+  void do_update_breakpoint (bool insert, const std::string& file, int line,
+                             const std::string& cond);
 
   void do_set_default_prompts (std::string& ps1, std::string& ps2,
                                std::string& ps4);
@@ -191,7 +192,7 @@
   void exit_debugger_signal (void);
 
   void update_breakpoint_marker_signal (bool insert, const QString& file,
-                                        int line);
+                                        int line, const QString& cond);
 
   void insert_debugger_pointer_signal (const QString&, int);
   void delete_debugger_pointer_signal (const QString&, int);