Documentation: Lifecycle of Editables inside GtkCellRenderers is not clear
When using the "editing-started" signal in GtkCellRenderer (https://developer.gnome.org/gtk3/stable/GtkCellRenderer.html#GtkCellRenderer-editing-started) you get an "Editable". However it is not clear from the documentation how long this Editable will live, leading to problems such as those described in #152 (closed). In the case of CellRendererText it seems that the Entry widget is unmapped and unparented after it loses focus, but is not destroyed until the CellRenderer that created it is destroyed.
The documentation should state what happens when the Editable loses focus and when it is destroyed. This will allow application programmers to design their code accordingly.