Fix for shadow folders.

Repro:
  - Set low animation scale (.3-.5)
  - Pkill Trebuchet
  - Open home screen and click open folder with ~12+

https://jira.cyanogenmod.org/browse/CYAN-4907

Change-Id: Ib927101e72674d5ffa3733f5c093c3f9970fa273
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_packages_apps_Trebuchet into kk