nostra13/Android-Universal-Image-Loader — pull request #752 by xbdtb (2014-09-17 05:09:17+00:00)
Title: Add force to refresh flag and processing logic

when a image is already cached, i want to refresh it from the same uri, but do not want to delete the cache first, because the new operation may be failed, and i want to keep the old cache, so, if success, then refresh the cache normally