pictureflow: Fix 'Update Cache' function and update manual

The artwork cache was previously always rebuilt,
even if you had selected the option to update.

"Preparing artwork" should be much quicker now
after a database update.

Change-Id: Ie81486e29d596b52afd21b01ba54c73f1b402be2

1 files changed, 3 insertions, 4 deletions

diff --git a/manual/plugins/pictureflow.tex b/manual/plugins/pictureflow.tex
index 1fb9f28c29..2c83a3941f 100644
--- a/manual/plugins/pictureflow.tex
+++ b/manual/plugins/pictureflow.tex
@@ -221,10 +221,9 @@ reduces the time it takes for cover art to be displayed.}}
   \item[Zoom.] Changes the distance at which slides are rendered from the ``camera''.
   \item[Resize Covers.] Set whether to automatically resize the covers or to leave
   them at their original size.
-  \item[Rebuild cache.] Rebuild the PictureFlow cache. This is needed in order
-  for PictureFlow to pick up new albums, and may occasionally be needed if albums
-  are removed.
-  \item[Update cache.] Update the PictureFlow cache. New albumart will be added.
+  \item[Rebuild cache.] Creates a fresh album index and builds the artwork cache from scratch.
+  \item[Update cache.] Creates a fresh album index and updates the existing artwork cache to
+  include newly added albums.
   \item[WPS integration.] Integrate PictureFlow with the While Playing Screen and enable
   the Current Playlist context menu.
   \item[Backlight.] Force backlight on while running pictureflow.