Merge pull request #8296 from crdlc/bug-842218-v2

Bug 842218 - Homescreen: lag when panning right to app list(cherry picked from commit 07b2f27bb7a94035bcc33e1c2a99ce7b61c4e6aa)
(cherry picked from commit faa2cd3042ab0a6d2c6d73b64d7991fee811735f)

Conflicts:
	apps/homescreen/js/grid.js