Just thinking, in https://github.com/geany/geany/pull/3859 I mapped matlab variables to `tm_tag_variable_t` so they are displayed in the sidebar but maybe the result is a little too verbose. Especially since it generates a tag for every variable assignment - I just tried it with some random code from github and it displays lots of identical variables in the sidebar, just every time the variable gets assigned.
So shouldn't we rather map it to `tm_tag_undef_t`?