This function is for use in widget implementations. Turns on flag
values in the current widget state (insensitive, prelighted, etc.).
It is worth mentioning that any other state than GTK_STATE_FLAG_INSENSITIVE,
will be propagated down to all non-internal children if widget is a
GtkContainer, while GTK_STATE_FLAG_INSENSITIVE itself will be propagated
down to all GtkContainer children by different means than turning on the
state flag down the hierarchy, both gtk_widget_get_state_flags() and
gtk_widget_is_sensitive() will make use of these.
This function is for use in widget implementations. Turns on flag values in the current widget state (insensitive, prelighted, etc.). It is worth mentioning that any other state than GTK_STATE_FLAG_INSENSITIVE, will be propagated down to all non-internal children if widget is a GtkContainer, while GTK_STATE_FLAG_INSENSITIVE itself will be propagated down to all GtkContainer children by different means than turning on the state flag down the hierarchy, both gtk_widget_get_state_flags() and gtk_widget_is_sensitive() will make use of these.