GTK bookmark manager polish.
GTK bookmark manager polish.

1. on right tree view, deselect everything when user presses below lowest row. This is not native gtktreeview behavior, but it is used in windows and by nautilus via libegg, so it matches user expectations.
2. allow default left click handler to run on right tree view. This allows a left click below the lowest row to cause the tree view pane to take focus.
3. continue blocking empty drags.

BUG=27869,27872

Review URL: http://codereview.chromium.org/417002

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@32585 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser