tree cca58aeb1960c107924c0f775e448ac09d002544
parent 0e4f50dcdd3af34f470906aab163384e417a0f4f
author Markus Duft <markus.duft@ssi-schaefer.com> 1520350005 +0100
committer Markus Duft <markus.duft@ssi-schaefer.com> 1520350005 +0100

Implement lazy nested task chains

This is required if a task chain itself already requires the computation
result of a task in the task chain. This happens for instance if the
task chain adds tasks based on workspace content, but the task chain is
run on an empty workspace and the first task populates projects.

Change-Id: Ifce327812ce9dad109ca4771f01d6ecae03eebf5