Checks if the expression is static.
A static expression will never change its result when [method@Gtk.Expression.evaluate] is called on it with the same arguments.
That means a call to [method@Gtk.Expression.watch] is not necessary because it will never trigger a notify.
TRUE if the expression is static
See Implementation
Checks if the expression is static.
A static expression will never change its result when [method@Gtk.Expression.evaluate] is called on it with the same arguments.
That means a call to [method@Gtk.Expression.watch] is not necessary because it will never trigger a notify.