hgweb: rely on a specific class to change cursor type in followlines UI The previous CSS rule would also apply in pages where followlines UI was not available (e.g. "changeset" view at /rev/<node>/). We insert a "followlines-select" class in JavaScript on actually selectable lines and restrict the CSS selector to use it.

hgweb: use a function expression for the install listener of followlines UI We define the listener of document's "DOMContentLoaded" inline in registration and use a function expression (anonymous) with everything inside. This makes it clearer that this file is not a library of JavaScript functions but rather an executable script. (Most of changes consists of reindenting the "followlinesBox" function, so mostly white space changes.)

formatter: use templatefilters.json() Now _jsonifyobj() is identical to templatefilters.json(paranoid=False).

templatefilters: use list comprehension in json() Not important, but the code slightly looks better.