pgf-umlsd increase space between entities based on label width

Question

How do you explicitly widen a sequence diagram created with pgf-umlsd, or, ideally, direct it to be as wide as required to show its labels without overlap?
Here is a very simple standalone document that uses A Long Method Name as the "call" part of a sequence diagram. Unfortunately, this overlaps with the two sequences under Client and Server.
Is it possible to direct the sequencediagram to be as wide as necessary to accommodate the text?
I consulted a few answers on this site and this document, which explains how to use postlevel to wrap things. This answer suggests using unitbox, but so far that has only adjusted the vertical spacing, it hasn't forced the diagram to become wider. The answers to [this question(https://tex.stackexchange.com/q/249200) do not seem to show a way to configure the sequence diagram as a whole to adapt to the width of its labels.
documentclass[preview]{standalone}
usepackage{pgf-umlsd}

begin{document}
begin{figure}
begin{sequencediagram}
newthread{A}{Client}{}
newthread{B}{Server}{}
begin{call}{A}{A Long Method Name}{B}{}
end{call}
end{sequencediagram}

end{figure}
end{document}

Torbjørn T. · Answer

Looking a little bit at the code, it doesn't at first glance look like there's a way of doing that as the package is written. A possible workaround would be to define a new macro for threads that includes another mandatory argument for an xshift of said thread. It's a bit crude, but works for this specific case.
(By the way, the bounding box is a bit wrong, as you can see if you run the example below, I haven't tried fixing that.)

documentclass{standalone}
usepackage{pgf-umlsd}

% based on newthread macro from pgf-umlsd.sty
% add fourth argument (third mandatory) that defines the xshift of a thread.
% that argument gets passed to newinst, which has an optional
% argument that defines the shift
newcommand{newthreadShift}[4][gray!30]{
  newinst[#4]{#2}{#3}
  stepcounter{threadnum}
  node[below of=insttheinstnum,node distance=0.8cm] (threadthethreadnum) {};
  tikzstyle{threadcolorthethreadnum}=[fill=#1]
  tikzstyle{instcolor#2}=[fill=#1]
}

begin{document}
begin{sequencediagram}
newthread{A}{Client}
newthreadShift{B}{Server}{4cm}
begin{call}{A}{A Long Method Name}{B}{}
end{call}
end{sequencediagram}

end{document}

pgf-umlsd increase space between entities based on label width

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