Incorrect parsing of names with spaced escape codes

[goerz]

Originally reported by @blegat in JuliaDocs/DocumenterCitations.jl#85

With a file issue.bib:

@misc{Unlu2024,
  title = {More issues with escaped unicode},
  author = {{\"U}nl{\"u}, {\c C}a{\u g}lar},
  year = {2024},
  note = {Bug Report #85},
}

the author name gets parsed incorrectly:

julia> import Bibliography

julia> bib = Bibliography.import_bibtex("issue.bib")
OrderedCollections.OrderedDict{String, BibInternal.Entry} with 1 entry:
  "Unlu2024" => Entry(Access("", "", ""), Name[Name("", "{\\\"U}nl{\\\"u}", "", "{\\c", "C}a{\\u g}lar")], "", Date("", "", "2024"), Name[], Eprint("", "", ""), "Unlu2024", In("", "…

julia> entry = bib["Unlu2024"]
BibInternal.Entry(BibInternal.Access("", "", ""), BibInternal.Name[BibInternal.Name("", "{\\\"U}nl{\\\"u}", "", "{\\c", "C}a{\\u g}lar")], "", BibInternal.Date("", "", "2024"), BibInternal.Name[], BibInternal.Eprint("", "", ""), "Unlu2024", BibInternal.In("", "", "", "", "", "", "", "", "", "", "", "", "", ""), Dict{String, String}(), "Bug Report #85", "More issues with escaped unicode", "misc")

julia> name = entry.authors[1]
BibInternal.Name("", "{\\\"U}nl{\\\"u}", "", "{\\c", "C}a{\\u g}lar")

julia> dump(name)
BibInternal.Name
  particle: String ""
  last: String "{\\\"U}nl{\\\"u}"
  junior: String ""
  first: String "{\\c"
  middle: String "C}a{\\u g}lar"

I'm guessing that the parser splits at the space before it processes the TeX group

[goerz]

Another example that fails (for the same reason):

@article{Lehtinen2007,
  title = {Estimating nucleation rates from apparent particle formation rates and vice versa: Revised formulation of the Kerminen–Kulmala equation},
  author = {Kari E.J. Lehtinen and Miikka {Dal Maso} and Markku Kulmala and Veli-Matti Kerminen},
  journal = {Journal of Aerosol Science},
  volume = {38},
  number = {9},
  pages = {988-994},
  year = {2007},
  doi = {10.1016/j.jaerosci.2007.06.009}
}