setRegion supports empty string

.gitignore

@@ -14,6 +14,9 @@ t.*
 a-*
 .cache
 tmp/
+test/
+*.vcf*
+*.bcf*
 test.cpp
 *.bin
 compile_commands.json

doc/latex.org

@@ -8,6 +8,6 @@
 #+latex_header: \DeclareCaptionFormat{listing}{\parbox{\textwidth}{\colorbox{gray}{\parbox{\textwidth}{#1#2#3}}\vskip-4pt}}
 #+latex_header: \captionsetup[lstlisting]{format=listing,labelfont=white,textfont=white}
 #+latex_header: \newlength\tdima \newlength\tdimb \setlength\tdima{ \fboxsep+\fboxrule} \setlength\tdimb{-\fboxsep+\fboxrule}
-#+latex_header: \lstset{frame=tlrb,xleftmargin=\tdima,xrightmargin=\tdimb, rulecolor=\color{gray}, keywordstyle=\ttfamily}
+#+latex_header: \lstset{breaklines=true,frame=tlrb,xleftmargin=\tdima,xrightmargin=\tdimb, rulecolor=\color{gray}, keywordstyle=\ttfamily}
 #+latex_header: \usepackage[backend=biber,style=authoryear-comp,date=year,sorting=nyt,sortlocale=auto,maxcitenames=1,maxbibnames=10,uniquename=init,maxitems=1,giveninits=true,terseinits=true,dashed=false,doi=true,isbn=false,url=false] {biblatex}
 #+latex_header: \addbibresource{ref.bib}