I have several macros which produce bracketed expressions, with bracket size automatically adjusted using
\left). This almost always works well. However, there are times when I feel that slightly larger brackets would be preferable - because the bracketed expression is so long, contains multiple brackets, etc.
Since I don't want to rewrite these macros, I figured out a work-around solution. I would just insert manually something tall (maybe
\phantom so that it does not display, and then try roll back by inserting a number of
\!'s. It works, but it's dirty.
How can I (nicely) create a whitespace which is tall (so that automatically sized delimiters become tall as well) but which only takes up a negligible amount of horizontal space?