* [GTK] Don't recreate master or detail if it didn't change
* [GTK] Fix several memory leaks using the Destroy pattern
Gtk objects must be disposed using the Destroy function that will
automatically iterate over the children and destroy them too:
https://developer.gnome.org/gtk2/stable/GtkWidget.html#gtk-widget-destroy
The gtk-sharp bindings discourage the use of Dispose and don't even call
the base class, leaving it without effect:
https://github.com/mono/gtk-sharp/blob/gtk-sharp-2-12-branch/gtk/Object.custom#L98
In the Controls, that inherits directly from native Gtk objects, the
overrides of the Dispose function are changed to override the Destroy
function. In the Renderers, that inherit from VisualElementRenderer,
the Destroy funtion is called in the dispose implementation so
subclasses only have to override Dispose (bool disposing) as they do
now.
* [GTK] Don't recreate the toolbar on each change
* [GTK] Fix leak connecting to the PropertyChanged event twice
When navigating to a new page, we should hide the previous
content and show the new one so that the previous page
renderer is not taken in account for redraws and resizes
E.Z. Hart
Andoni Morales Alastruey
Frank A. Krueger
Javier Suárez Ruiz