[Bug] Incorrect MathML export for multiple entries at once

[jhulala]

When an image contains multiple lines/entries, the exported MathML code is incorrect

To reproduce, follow these steps:

(1) Use this image:

(2) The exported MathML code is as follows:

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <mfrac>
    <mrow>
      <mn>2</mn>
      <mo stretchy="false">(</mo>
      <mn>1</mn>
      <mo>+</mo>
      <mi>sin</mi>
      <mo data-mjx-texclass="NONE">⁡</mo>
      <mo stretchy="false">(</mo>
      <mi>x</mi>
      <mo stretchy="false">)</mo>
      <mo stretchy="false">)</mo>
    </mrow>
    <mrow>
      <mi>cos</mi>
      <mo data-mjx-texclass="NONE">⁡</mo>
      <mo stretchy="false">(</mo>
      <mi>x</mi>
      <mo stretchy="false">)</mo>
      <mo stretchy="false">(</mo>
      <mi>sin</mi>
      <mo data-mjx-texclass="NONE">⁡</mo>
      <mo stretchy="false">(</mo>
      <mi>x</mi>
      <mo stretchy="false">)</mo>
      <mo>+</mo>
      <mn>1</mn>
      <mo stretchy="false">)</mo>
    </mrow>
  </mfrac>
</math>

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <mfrac>
    <mn>2</mn>
    <mrow>
      <mi>cos</mi>
      <mo data-mjx-texclass="NONE">⁡</mo>
      <mo stretchy="false">(</mo>
      <mi>x</mi>
      <mo stretchy="false">)</mo>
    </mrow>
  </mfrac>
</math>

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <mn>2</mn>
  <mi>sec</mi>
  <mo data-mjx-texclass="NONE">⁡</mo>
  <mo stretchy="false">(</mo>
  <mi>x</mi>
  <mo stretchy="false">)</mo>
</math>

(3) The expected result should be similar to this:

<math xmlns="http://www.w3.org/1998/Math/MathML">
  <mfrac>
    <mrow>
      <mn>2</mn>
      <mo stretchy="false">(</mo>
      <mn>1</mn>
      <mo>+</mo>
      <mi>sin</mi>
      <mo data-mjx-texclass="NONE">⁡</mo>
      <mo stretchy="false">(</mo>
      <mi>x</mi>
      <mo stretchy="false">)</mo>
      <mo stretchy="false">)</mo>
    </mrow>
    <mrow>
      <mi>cos</mi>
      <mo data-mjx-texclass="NONE">⁡</mo>
      <mo stretchy="false">(</mo>
      <mi>x</mi>
      <mo stretchy="false">)</mo>
      <mo stretchy="false">(</mo>
      <mi>sin</mi>
      <mo data-mjx-texclass="NONE">⁡</mo>
      <mo stretchy="false">(</mo>
      <mi>x</mi>
      <mo stretchy="false">)</mo>
      <mo>+</mo>
      <mn>1</mn>
      <mo stretchy="false">)</mo>
    </mrow>
  </mfrac>
  <mfrac>
    <mn>2</mn>
    <mrow>
      <mi>cos</mi>
      <mo data-mjx-texclass="NONE">⁡</mo>
      <mo stretchy="false">(</mo>
      <mi>x</mi>
      <mo stretchy="false">)</mo>
    </mrow>
  </mfrac>
  <mn>2</mn>
  <mi>sec</mi>
  <mo data-mjx-texclass="NONE">⁡</mo>
  <mo stretchy="false">(</mo>
  <mi>x</mi>
  <mo stretchy="false">)</mo>
</math>

---

The problem is that the export contains the tag <math xmlns="http://www.w3.org/1998/Math/MathML"> multiple times, which prevents a proper pasting into Microsoft Word document. Adding an extra space between independent parts would be also beneficial, so the formulas are not squeezed into one line/part.

I used the latest and up-to-date version of Windows 10

[github-actions[bot]]

[Auto response] Looks like this is your first issue. I will look into it as soon as possible.

[blaisewang]

The result is returned by the Mathpix API which contains multiple MathML equations. This app simply concatenates all equations together.

[jhulala]

@blaisewang, I understand that Mathpix API returns multiple MathML equations, but grouping them together is not a solution, because users won't be able to paste them into Microsoft Word. You perhaps haven't tried it, so you don't know how useless it is. A simple one-line regex command (regular expression substitution) would fix this very easily. See https://regexr.com/5mpo7 for the solution.

[github-actions[bot]]

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