Autocomplete of references/new commands does not work backwards.

Suppose you have two files `foo.tex` and `bar.tex`.

In `foo.tex` the command `\foo` is defined, and in `bar.tex` the command `\bar` is defined.

In `foo.tex` you include `bar.tex`.

Then, both `\foo` and `\bar` are available in the autocomplete of `foo.tex`, but only `\bar` shows up in the autocomplete of `bar.tex` where both should have been available.

Affected versions: b0.3 and b0.3.1