In R it is possible to customise the appearance of a dendrogram and set a custom start character for the last branches. According to the documentation:
In some environments, using
'will provide much nicer looking output, than the historical default
Emacs ESS does just this and, in
ess-s-l.el, sets the option
str.dendrogram.last to a single quote. It is a sort of strict requirement, in fact, contrary to the Emacs ESS philosophy (where everything can be customised), this setting is hardcoded in
ess-s-l.el and is difficult to override. Therefore I assume that Emacs is one of those environments where single quotes look much nicer than backticks.
Anyway, in my current Windows Emacs version, backticks look perfect and I am going (trying) to get rid of it.
However I wonder whether there is some situation where backticks might display poorly or it is a problem showed in some old Emacs version.