[gtkmm] Demos: Fix make check after changes in Glib::SignalProxy::connect()

[Kjell Ahlstedt <kjellahl src gnome org>]

commit dd0732d915f499049a0a2593ba60755f5fd6b2c4
Author: Kjell Ahlstedt <kjellahlstedt gmail com>
Date:   Tue Apr 25 10:03:11 2017 +0200

    Demos: Fix make check after changes in Glib::SignalProxy::connect()
    
    Bug 126213

 demos/gtk-demo/example_change_display.cc |    4 ++--
 demos/gtk-demo/example_drawingarea.cc    |    6 +++---
 demos/gtk-demo/example_glarea.cc         |    2 +-
 demos/gtk-demo/example_iconbrowser.cc    |    2 +-
 4 files changed, 7 insertions(+), 7 deletions(-)
---
diff --git a/demos/gtk-demo/example_change_display.cc b/demos/gtk-demo/example_change_display.cc
index 484ff93..ad156b8 100644
--- a/demos/gtk-demo/example_change_display.cc
+++ b/demos/gtk-demo/example_change_display.cc
@@ -314,8 +314,8 @@ Gtk::Window* Example_ChangeDisplay::query_for_toplevel(const Glib::RefPtr<Gdk::S
   if(grabbed == Gdk::GrabStatus::SUCCESS )
   {
     m_popup_clicked = false;
-    m_pPopup->signal_button_release_event().connect( sigc::mem_fun(*this, 
&Example_ChangeDisplay::on_popup_button_release_event) );
-
+    m_pPopup->signal_button_release_event().connect(
+      sigc::mem_fun(*this, &Example_ChangeDisplay::on_popup_button_release_event), false);
 
     // Process events until clicked is set by button_release_event_cb.
     // We pass in may_block=true since we want to wait if there
diff --git a/demos/gtk-demo/example_drawingarea.cc b/demos/gtk-demo/example_drawingarea.cc
index ee0d9b6..41bb277 100644
--- a/demos/gtk-demo/example_drawingarea.cc
+++ b/demos/gtk-demo/example_drawingarea.cc
@@ -93,13 +93,13 @@ Example_DrawingArea::Example_DrawingArea()
 
   /* Signal used to handle backing surface */
   m_DrawingArea_Scribble.signal_configure_event().connect(
-      sigc::mem_fun(*this, &Example_DrawingArea::on_drawingarea_scribble_configure_event));
+      sigc::mem_fun(*this, &Example_DrawingArea::on_drawingarea_scribble_configure_event), false);
 
   /* Event signals */
   m_DrawingArea_Scribble.signal_motion_notify_event().connect(
-      sigc::mem_fun(*this, &Example_DrawingArea::on_drawingarea_scribble_motion_notify_event));
+      sigc::mem_fun(*this, &Example_DrawingArea::on_drawingarea_scribble_motion_notify_event), false);
   m_DrawingArea_Scribble.signal_button_press_event().connect(
-      sigc::mem_fun(*this, &Example_DrawingArea::on_drawingarea_scribble_button_press_event));
+      sigc::mem_fun(*this, &Example_DrawingArea::on_drawingarea_scribble_button_press_event), false);
 
   /* Ask to receive events the drawing area doesn't normally
    * subscribe to.
diff --git a/demos/gtk-demo/example_glarea.cc b/demos/gtk-demo/example_glarea.cc
index 847f488..b6f4d8a 100644
--- a/demos/gtk-demo/example_glarea.cc
+++ b/demos/gtk-demo/example_glarea.cc
@@ -85,7 +85,7 @@ Example_GLArea::Example_GLArea() : m_RotationAngles(N_AXIS, 0.0f)
   // Important that the unrealize signal calls our handler to clean up
   // GL resources _before_ the default unrealize handler is called (the "false")
   m_GLArea.signal_unrealize().connect(sigc::mem_fun(*this, &Example_GLArea::unrealize), false);
-  m_GLArea.signal_render().connect(sigc::mem_fun(*this, &Example_GLArea::render));
+  m_GLArea.signal_render().connect(sigc::mem_fun(*this, &Example_GLArea::render), false);
 
   m_VBox.add(m_Controls);
   m_Controls.set_hexpand(true);
diff --git a/demos/gtk-demo/example_iconbrowser.cc b/demos/gtk-demo/example_iconbrowser.cc
index 12a1f8d..b9285e0 100644
--- a/demos/gtk-demo/example_iconbrowser.cc
+++ b/demos/gtk-demo/example_iconbrowser.cc
@@ -254,7 +254,7 @@ Example_IconBrowser::Example_IconBrowser()
   m_icon_view.signal_item_activated().connect(
     sigc::mem_fun(*this, &Example_IconBrowser::on_icon_view_item_activated));
   m_icon_view.signal_query_tooltip().connect(
-    sigc::mem_fun(*this, &Example_IconBrowser::on_icon_view_query_tooltip));
+    sigc::mem_fun(*this, &Example_IconBrowser::on_icon_view_query_tooltip), false);
   m_search_bar.property_search_mode_enabled().signal_changed().connect(
     sigc::mem_fun(*this, &Example_IconBrowser::on_search_bar_search_mode_enabled_changed));
   m_search_entry.signal_search_changed().connect(