[gtkmm-documentation] Replace Menu::popup() by Menu::popup_at_pointer()

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 9843f9d23da6681fdee396bb0f6cafd8decb6157
Author: Kjell Ahlstedt <kjell ahlstedt bredband net>
Date:   Tue Nov 8 19:17:37 2016 +0100

    Replace Menu::popup() by Menu::popup_at_pointer()
    
    * examples/book/menus/popup/examplewindow.cc:
    * examples/book/treeview/popup/treeview_withpopup.cc: Replace the deprecated
    Menu::popup() by the new Menu::popup_at_pointer().
    * examples/others/cellrenderercustom/cellrenderertoggle.cc: Don't use an
    anonymous namespace. gcc 6.2.0 reports errors because there are unused
    functions. (I don't want to remove them. I suppose someone has planned to
    use them some time.)

 examples/book/menus/popup/examplewindow.cc         |    5 ++++-
 examples/book/treeview/popup/treeview_withpopup.cc |    8 +++++---
 .../cellrenderercustom/cellrenderertoggle.cc       |   12 ++++++------
 3 files changed, 15 insertions(+), 10 deletions(-)
---
diff --git a/examples/book/menus/popup/examplewindow.cc b/examples/book/menus/popup/examplewindow.cc
index d19900f..6c9e052 100644
--- a/examples/book/menus/popup/examplewindow.cc
+++ b/examples/book/menus/popup/examplewindow.cc
@@ -122,8 +122,11 @@ bool ExampleWindow::on_button_press_event(GdkEventButton* button_event)
     }
 
     if(m_pMenuPopup)
-      m_pMenuPopup->popup(button_event->button, button_event->time);
+      m_pMenuPopup->popup_at_pointer((GdkEvent*)button_event);
 
+      // Menu::popup_at_pointer() is new in gtkmm 3.22.
+      // If you have an older revision, try this:
+      //m_pMenuPopup->popup(button_event->button, button_event->time);
 
     return true; //It has been handled.
   }
diff --git a/examples/book/treeview/popup/treeview_withpopup.cc 
b/examples/book/treeview/popup/treeview_withpopup.cc
index fc74249..ddcac5b 100644
--- a/examples/book/treeview/popup/treeview_withpopup.cc
+++ b/examples/book/treeview/popup/treeview_withpopup.cc
@@ -1,5 +1,3 @@
-//$Id: treeview_withpopup.cc 836 2007-05-09 03:02:38Z jjongsma $ -*- c++ -*-
-
 /* gtkmm example Copyright (C) 2002 gtkmm development team
  *
  * This program is free software; you can redistribute it and/or modify
@@ -77,7 +75,11 @@ bool TreeView_WithPopup::on_button_press_event(GdkEventButton* button_event)
   //Then do our custom stuff:
   if( (button_event->type == GDK_BUTTON_PRESS) && (button_event->button == 3) )
   {
-    m_Menu_Popup.popup(button_event->button, button_event->time);
+    m_Menu_Popup.popup_at_pointer((GdkEvent*)button_event);
+
+    // Menu::popup_at_pointer() is new in gtkmm 3.22.
+    // If you have an older revision, try this:
+    //m_Menu_Popup.popup(button_event->button, button_event->time);
   }
 
   return return_value;
diff --git a/examples/others/cellrenderercustom/cellrenderertoggle.cc 
b/examples/others/cellrenderercustom/cellrenderertoggle.cc
index c86193b..d2e7235 100644
--- a/examples/others/cellrenderercustom/cellrenderertoggle.cc
+++ b/examples/others/cellrenderercustom/cellrenderertoggle.cc
@@ -1,5 +1,3 @@
-//$Id: cellrenderertoggle.cc 613 2006-05-10 20:59:28Z murrayc $ -*- c++ -*-
-
 /* gtkmm example Copyright (C) 2002 gtkmm development team
  *
  * This program is free software; you can redistribute it and/or modify
@@ -24,9 +22,11 @@
 #include <gtkmm.h>
 #include <sstream>
 
-
-namespace
-{
+// Can't have MyCellRendererToggle in an anonymous namespace, because then
+// gcc 6.2.0 reports unused functions as errors when compiling with
+// --enable-warnings=fatal.
+//namespace
+//{
 
 class MyCellRendererToggle : public Gtk::CellRenderer
 {
@@ -283,7 +283,7 @@ void AppWindow::on_cell_toggled(const Glib::ustring& path_string)
   row[list_columns_.active] = !row[list_columns_.active];
 }
 
-} // anonymous namespace
+//} // anonymous namespace
 
 
 int main(int argc, char** argv)