getAllocatedBaseline
⚠️ Deprecated ⚠️
This is deprecated since version 4.12.
Use method@Gtk.Widget.get_baseline instead
---Returns the baseline that has currently been allocated to @widget.
This function is intended to be used when implementing handlers for the GtkWidget
Class.snapshot() function, and when allocating child widgets in GtkWidget
Class.size_allocate().
Return
the baseline of the @widget, or -1 if none