This is a variation of a Sequential Task, in which a subtask failing
will prompt the next one to execute, and a subtask being successful will
stop the task.
This way, this can be used for easily managing fallbacks with tasks. :D
Signed-off-by: flow <flowlnlnln@gmail.com>
Previously, it would not update the global counter if the subTask didn't
update its progress, even though progress was being made.
This also prevents a segmentation fault while aborting the task.
Signed-off-by: flow <flowlnlnln@gmail.com>
This puts all mod downloading tasks inside a SequentialTask, which is,
for more than one task, a multi step task. This is handled by the
ProgressDialog by showing both the global progress of tasks executed,
and the individual progress of each of them.
