Q:

Inkscape : Procedure to undo uneven linewidth

I do scientific drawings and I often need to import curves from pyplot with an svg format.

But when I stretch then too heavily, here is what happens:

Yet, what I would like is a stroke that stays even, no matter how much you rescale it. 
This issue have been here for years and never corrected, and I was never able to find a procedure that removes this thing without fail. Could anyone tell me a procedure to remove this think for sure, or the position in the xml file of the option that does this ?
I included below the code of an svg file showing the problem as an example.
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!-- Created with Inkscape (http://www.inkscape.org/) -->

<svg
   xmlns:dc="http://purl.org/dc/elements/1.1/"
   xmlns:cc="http://creativecommons.org/ns#"
   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
   xmlns:svg="http://www.w3.org/2000/svg"
   xmlns="http://www.w3.org/2000/svg"
   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
   width="38.289249mm"
   height="179.07323mm"
   viewBox="0 0 38.28925 179.07325"
   version="1.1"
   id="svg6539"
   inkscape:version="0.92.4 (5da689c313, 2019-01-14)"
   sodipodi:docname="MWEs - Copie.svg">
  <defs
     id="defs6533">
    <clipPath
       id="pcbefdf05c9">
      <rect
         height="326.16"
         width="558"
         x="90"
         y="51.84"
         id="rect417" />
    </clipPath>
  </defs>
  <sodipodi:namedview
     id="base"
     pagecolor="#ffffff"
     bordercolor="#666666"
     borderopacity="1.0"
     inkscape:pageopacity="0.0"
     inkscape:pageshadow="2"
     inkscape:zoom="0.9899495"
     inkscape:cx="203.88158"
     inkscape:cy="346.31362"
     inkscape:document-units="mm"
     inkscape:current-layer="layer1"
     showgrid="false"
     showguides="false"
     fit-margin-top="10"
     fit-margin-left="10"
     fit-margin-right="10"
     fit-margin-bottom="10"
     inkscape:window-width="1920"
     inkscape:window-height="986"
     inkscape:window-x="-11"
     inkscape:window-y="-11"
     inkscape:window-maximized="1"
     inkscape:snap-global="true"
     inkscape:snap-bbox="true"
     inkscape:bbox-paths="true"
     inkscape:bbox-nodes="true"
     inkscape:snap-bbox-edge-midpoints="true"
     inkscape:snap-bbox-midpoints="true"
     inkscape:object-paths="true"
     inkscape:snap-intersection-paths="true"
     inkscape:snap-smooth-nodes="true"
     inkscape:snap-midpoints="true"
     inkscape:snap-object-midpoints="true"
     inkscape:snap-center="true"
     inkscape:snap-text-baseline="true"
     inkscape:snap-page="true" />
  <metadata
     id="metadata6536">
    <rdf:RDF>
      <cc:Work
         rdf:about="">
        <dc:format>image/svg+xml</dc:format>
        <dc:type
           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
        <dc:title></dc:title>
      </cc:Work>
    </rdf:RDF>
  </metadata>
  <g
     inkscape:label="Calque 1"
     inkscape:groupmode="layer"
     id="layer1"
     transform="translate(125.14134,60.95706)">
    <path
       style="fill:none;stroke:#1f77b4;stroke-width:33.15565872;stroke-linecap:butt;stroke-linejoin:round;stroke-miterlimit:4;stroke-dasharray:none;stroke-dashoffset:0;stroke-opacity:1"
       clip-path="none"
       d="m 622.63636,66.665452 c -67.77884,0.239241 -135.57687,0.06619 -203.3364,1.917431 -76.17193,4.056124 -165.2995,1.147605 -222.44225,60.613027 -55.74299,64.2052 -69.76372,152.5374 -81.49407,233.97864"
       id="path4850"
       inkscape:connector-curvature="0"
       sodipodi:nodetypes="cccc"
       transform="matrix(0.03492049,0,0,0.50427365,-118.5969,-76.21498)" />
  </g>
</svg>

A:

There is a setting to disable scaling stroke width as the object is scaled.

Uncheck this button, and the stroke will keep its width regardless of scaling. The other 3 buttons control scaling of rounded corners, gradients and bitmaps.

