Sets the type of animation used for reveal and fold transitions in self.
propertyFlap:flap is transparent by default, which means the content will
be seen through it with adw.types.FlapTransitionType.Over transitions; add the
`.background` style class to it if this is
unwanted.
Sets the type of animation used for reveal and fold transitions in self.
propertyFlap:flap is transparent by default, which means the content will be seen through it with adw.types.FlapTransitionType.Over transitions; add the `.background` style class to it if this is unwanted.