Minecraft wiki entry for Development_versions, associated text: Fixed a bug causing error messages while logging in to immediately disappear.
Fixed a bug in how version file fields for downloads and logging are treated for versions which inherit other versions.
Fixed the downloads field of versions not being treated as optional.
Fixed empty lines sometimes appearing in the launcher log file.
Fixed the drop down arrow in the installation selection sometimes covering up the text.
MCL-8389 - Log output not auto-scrolling.