Like gtk_builder_value_from_string(), this function demarshals
a value from a string, but takes a GType instead of GParamSpec.
This function calls g_value_init() on the value argument, so it
need not be initialised beforehand.
Upon errors FALSE will be returned and error will be assigned a
GError from the GTK_BUILDER_ERROR domain.
Since 2.12
Like gtk_builder_value_from_string(), this function demarshals a value from a string, but takes a GType instead of GParamSpec. This function calls g_value_init() on the value argument, so it need not be initialised beforehand. Upon errors FALSE will be returned and error will be assigned a GError from the GTK_BUILDER_ERROR domain. Since 2.12