Biblatex, weird spaces around citations

Question

Latex newbie here :)

I am currently working on my Thesis, which is written in Basque language. However, I would like to have the bibliography in English. This is the piece of code I am currently using:

\usepackage[english,basque]{babel}
\usepackage[autostyle=false]{csquotes}
\usepackage[style=phys, %
articletitle=false,%
biblabel=brackets,%
chaptertitle=false, pageranges=false,%
sorting=none, %
language=english,
autolang=other %
]{biblatex}

Although the "References" section looks as expected, every time I make a citation with \cite{somereference} it places some weird spacing around the square brackets in the text:

How could I fix this issue? Thank you very much, in advance :)

Answer 1

The following MWE reproduces the issue

\documentclass{article}
\usepackage[english,basque]{babel}
\usepackage[autostyle=false]{csquotes}
\usepackage[style=numeric-comp,
  language=english, autolang=other]{biblatex}
\addbibresource{biblatex-examples.bib}
\begin{document}
\cite{sigfridsson,worman,geer,nussbaum}
\printbibliography
\end{document}

The problem is a missing % in basque.ldf. Currently (v1.0f, 2005/03/29), ll. 90-91 read

\addto\noextrasbasque{
  \bbl@deactivate{"}\bbl@deactivate{~}}

but that should be

\addto\noextrasbasque{%
  \bbl@deactivate{"}\bbl@deactivate{~}}

with a % after the opening curly brace (see What is the use of percent signs (%) at the end of lines? (Why is my macro creating extra space?) for details about % at end of lines).

Contact the maintainer of babel-basque about this small oversight. If you want a short MWE for the bug report, you can use

\documentclass[american,basque]{article}
\usepackage{babel}
\begin{document}
A\foreignlanguage{american}{B}C
\end{document}

If you need a solution now, you could create a local copy of basque.ldf and fix the issue there – or you could add

\addto\noextrasbasque{\ifhmode\unskip\fi}

to your preamble. The \unskip counters the space that was introduced by the missing %, but this is only required and desirable in horizontal mode (in vertical mode the \unskip would get rid of vertical space that should probably remain as is).