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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%% Experimental feature for pointing out moving things. %%%%
%%%% Buggy? Write to: kopeckyf@hu-berlin.de %%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\usetikzlibrary{arrows,arrows.meta}
\newcounter{lsConnectTempGroup}
\NewDocumentCommand\ConnectTail{m O{\thelsConnectTempGroup}}{%read: mandatory arg #1, optional argument #2 with the current group counter as its default value.
\edef\lsConnectTempPosition{#2}%\edef expands the argument, which means reading the current value of the counter.
{\tikz[remember picture,
anchor=base, baseline,
inner xsep=0pt,
inner ysep=-.5ex]\node (ConnectTempTail\lsConnectTempPosition) {\strut{}#1};}%\strut for baseline
}
\NewDocumentCommand\ConnectHead{s O{1ex} m O{\thelsConnectTempGroup}}{%read: star #1, optional argument (distance of arrow from text= std. one x-height), mand. arg. (node text), optional argument #2, the group specifier
\edef\lsConnectTempPosition{#4}%
\stepcounter{lsConnectTempGroup}%We have a match, let's update the group counter
{\tikz[remember picture,
anchor=base, baseline,
inner xsep=0pt,
inner ysep=-.5ex] \node (ConnectTempHead\lsConnectTempPosition) {\strut{}#3};%
\tikz[remember picture] \draw[% we have a tail and a head, let's bring them together
\IfBooleanTF#1{{Triangle[]}-}{-{Triangle[]}},% Check if the starred version is used. The starred version is right->left, the normal version left->right
overlay] (ConnectTempTail\lsConnectTempPosition.south) -- ++(0,-#2) -| (ConnectTempHead\lsConnectTempPosition.south);
}%
}
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