Scale own math symbol / image appropriately

Question

In this thread we learned how to create our own math symbol. Now the question is how we force it to scale appropriately when used in sub- or superscript:
See the following example:
documentclass[12pt]{article}%, border=2pt]{standalone}
usepackage{graphics}

DeclareRobustCommand{triangleLeft}{ensuremath{includegraphics{triangleLeft}}}

begin{document}
$triangleLeft_{x}$
$X_{triangleLeft_{x}}$

begin{figure}
caption{$triangleLeft_{x}$ test}
end{figure}

end{document}

As we see in the result. The image is equally big in the subscript but it should be scaled down a little bit.

Do you have any ideas how I can fix this?
Kind regards and Thanks,
Max

Steven B. Segletes · Answer

The features of scalerel can accomplish this.
documentclass[12pt]{article}%, border=2pt]{standalone}
usepackage{MnSymbol}
usepackage{sansmath}
usepackage{stackengine, amsfonts,scalerel} %
newcommand{leftharpoontriangleX}{mathord{ensurestackMath{%
  stackinset{c}{0pt}{c}{-0.3ex}{scriptstyleleftharpoonup}%
  {largetriangleup}}}}
newcommand{rightharpoontriangleX}{mathord{ensurestackMath{%
  stackinset{c}{0pt}{c}{-0.3ex}{scriptstylerightharpoonup}%
  {largetriangleup}}}}
newcommand{leftharpoontriangle}{%
  scalerel*{leftharpoontriangleX}{largetriangleup}}
newcommand{rightharpoontriangle}%
  {scalerel*{rightharpoontriangleX}{largetriangleup}}
begin{document}

sansmath
 $ rightharpoontriangle_{!x}quadleftharpoontriangle_{!x}$

$ x_{rightharpoontriangle}quad x_{leftharpoontriangle}$

$ y_{ x_{rightharpoontriangle}quad x_{leftharpoontriangle}}$
end{document}

Scale own math symbol / image appropriately

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