Cancellable.pushCurrent

Pushes cancellable onto the cancellable stack. The current cancellable can then be received using [gio.cancellable.Cancellable.getCurrent].

This is useful when implementing cancellable operations in code that does not allow you to pass down the cancellable object.

This is typically called automatically by e.g. #GFile operations, so you rarely have to call this yourself.