This method implements some custom handling for skipping over whitespace when parsing tokens into an expression tree.

In the case of parse-time control directives (e.g. [? TAGS '(* *)' ?]) we want to hide the tokens inside the directive from the expression parser because they have already been interpreted at tokenising time and don't equate to runtime expressions that the parser understands.

So the tokeniser for these tags adds a BRANCH entry in the start token for the directive that points to the end token. When either of the next_skip_ws() or skip_ws() methods are called on one of these start tokens (as we always do when a whitespace token parse_expr() method is called) then we jump straight down to the end token and continue from there.

For all other tags, we advance to the next token as usual.

An alias to the next_skip_ws() method.

This method is called by a Template::TT3::View object as part of the double dispatch process that is used to render views of template elements. It calls the view_tag_start() method against the view object passed as the only argument, $view. It passes itself as an argument to the view_tag_start() method.