hgweb: define locally used variables as actually local in mercurial.js
Variables that are used or assigned without any declaration using var (or let,
or const) are considered global. In many cases this is inadvertent and actually
causes a variable leaking to a broader scope, such as a temporary variable used
inside a loop suddenly being accessible in global scope. (This corresponds to
"undef" option of jshint).
So this patch limits the scope of variables that don't need to be global. There
are a lot of helper variables in Graph.render() used in a loop, I've declared
them all on one line to reduce patch size. "radius" is special because it
wasn't passed to graph.vertex, but was used there (it worked because this
variable leaked to global scope). "window.graph" is created by an inline script
in graph.tmpl so that it can be used in ajaxScrollInit() function, this patch
makes this fact explicit by assigning window.graph to a local variable.