The current implementation of tagbar does not allow for setting the
search-method in the `tagbar#currenttag` function. In
https://github.com/preservim/tagbar/pull/696, tagbar implemented this,
which has three options: nearest, neartest-stl, and scoped-stl.
The reason for adding this - for me, at least - is to use the scoped-stl
option, so that the statusline will display the proper function when
there are nested functions. (Otherwise, once you go past a nested
function, tagbar#currenttag still returns the nested function rather
than the function it was nested in.)
