Some make corrections for HP and related,

Changed refresh order so that window-less widgets
    don't get overdrawn anymore,
  Prevent GTK from filtering our supposedly unneeded
    expose events,
  Block all expose calls if a resize is requested and
    do a full redraw then, thus removing flicker and
    behaving like wxMSW,
  Moved some doubled expose and draw code from GtkPizza
    to the respective callbacks in window.cpp,
  Set idle priority to a higher value (which should
    indicate a lower priority if I interpret glib.h
    correctly) but the desired side-effect didn't
    really show up.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@6533 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/app.cpp

@@ -95,8 +95,8 @@ bool wxYield()
 
     if (has_idle)
     {
-        /* re-add idle handler */
-        wxTheApp->m_idleTag = gtk_idle_add( wxapp_idle_callback, (gpointer) NULL );
+        /* re-add idle handler (very low priority) */
+        wxTheApp->m_idleTag = gtk_idle_add_priority( 500, wxapp_idle_callback, (gpointer) NULL );
     }
 
     // disable log flushing from here because a call to wxYield() shouldn't
@@ -177,9 +177,9 @@ void wxapp_install_idle_handler()
        indicating that the idle is over. It may also
        get called from other thread for sending events
        to the main thread (and processing these in
-       idle time). */
+       idle time). Very low priority. */
 
-    wxTheApp->m_idleTag = gtk_idle_add( wxapp_idle_callback, (gpointer) NULL );
+    wxTheApp->m_idleTag = gtk_idle_add_priority( 500, wxapp_idle_callback, (gpointer) NULL );
 
     g_isIdle = FALSE;
 }