Sets or clears task's check-cancellable flag. If this is TRUE
(the default), then g_task_propagate_pointer(), etc, and
g_task_had_error() 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
(G_IO_ERROR_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 g_task_return_error_if_cancelled()).
If you are using g_task_set_return_on_cancel() as well, then
you must leave check-cancellable set TRUE.
Since 2.36
Sets or clears task's check-cancellable flag. If this is TRUE (the default), then g_task_propagate_pointer(), etc, and g_task_had_error() 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 (G_IO_ERROR_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 g_task_return_error_if_cancelled()). If you are using g_task_set_return_on_cancel() as well, then you must leave check-cancellable set TRUE. Since 2.36