This patch adds a few features to tag browser. It makes it possible to
de-select a selected file, adds automatic construction of file query
parameter using history API and makes links in css source act like the
file selector buttons in the tag browser. In addition, this patch makes
adding files that end with "_support.css" (like window_control_placeholder_support) always be put it as the first
item in the preview.
116199ce0d
