remove the dummy sidenav from samples before populating the real list.
Also make the line numbers hidden before they get moved to avoid
some jankyness during load.

Change-Id: I11c3df6d6c7a9a2e74be938b0f0ec704e71eb8d4
(cherry picked from commit 36ea7a3d74c68d62a5d081401b887e848370f6d8)
2 files changed