Task.setCheckCancellable

Sets or clears task's check-cancellable flag. If this is true (the default), then [gio.task.Task.propagatePointer], etc, and [gio.task.Task.hadError] will check the task's #GCancellable first, and if it has been cancelled, then they will consider the task to have returned an "Operation was cancelled" error ([gio.types.IOErrorEnum.Cancelled]), regardless of any other error or return value the task may have had.

If check_cancellable is false, then the #GTask will not check the cancellable itself, and it is up to task's owner to do this (eg, via [gio.task.Task.returnErrorIfCancelled]).

If you are using [gio.task.Task.setReturnOnCancel] as well, then you must leave check-cancellable set true.