Double equal sign - Problem with usepackage[T1]{fontenc}

Question

I have made a macro to type a double equal sign but the signs are thinner when I use usepackage[T1]{fontenc} (see the picture and the code below). How can I fix this?

documentclass[12pt,a4paper]{article}

usepackage[utf8]{inputenc}
usepackage[T1]{fontenc} % <--- This is the guilty package
usepackage{ucs}

usepackage{amsmath}
usepackage{graphicx}
usepackage{calc}

newcommandshorteq{resizebox{.5em}{heightof{=}}{=}}

newcommandeqtest{mathop{shorteqmkern1mushorteq}}

begin{document}

$A eqtest B$

$A = B$

end{document}

egreg · Accepted Answer

You're using the text mode = instead of the math mode one.
Here's a different implementation that also scales automatically in subscripts and superscripts. You don't need calc, because in the context of resizebox you can use width and height to refer to the dimensions of the box being resized.
documentclass[12pt,a4paper]{article}

usepackage[T1]{fontenc}

usepackage{amsmath}
usepackage{graphicx}

makeatletter
newcommandshorteq{mathrel{mathpaletteshorteq@{.75}}}
newcommand{shorteq@}[2]{%
  resizebox{#2width}{height}{$m@th#1=$}%
}
makeatother

begin{document}

$A shorteq B$

$A = B$

$X_{ashorteq b}$

$X_{a=b}$

end{document}

Notes.

ucs is obsolete and does nothing useful

inputenc is not necessary if utf8 input is used.

A relative width has been used (adjust it to suit) rather than 0.5em that makes little sense.

Double equal sign - Problem with usepackage[T1]{fontenc}

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