The following code is flagged as dead (since it's *replacing* rather than updating the existing Object):
https://github.com/mozilla/pdf.js/blob/4483cba72410027acf46630ebf252ae529704476/src/core/xfa/template.js#L2336-L2339
according to the alert in https://github.com/mozilla/pdf.js/security/code-scanning/103?query=ref%3Arefs%2Fheads%2Fmaster

Looking at the surrounding code, I can see a couple of possibilities here:
 1. This is indeed just dead code, which should be removed.
 2. The code should be moved up, and placed just *above* the previous block instead.
 3. There should be other, more invasive, changes made to this code...

/cc @calixteman Which solution is correct here?
Assuming it's either option 1 or 2, I can submit a patch to fix this.
fixDimensions(this);
    const children = [];
    const attributes = {
      id: this[$uid],
      class: [],
    };
    setAccess(this, attributes.class);
    if (!this[$extra]) {
      this[$extra] = Object.create(null);
    }
    Object.assign(this[$extra], {
      children,
      line: null,
      attributes,
      attempt: 0,
      numberInLine: 0,
      availableSpace: {
        width: Math.min(this.w || Infinity, availableSpace.width),
        height: Math.min(this.h || Infinity, availableSpace.height),
      },
      width: 0,
      height: 0,
      prevHeight: 0,
      currentWidth: 0,
    });
    const root = this[$getTemplateRoot]();
    const currentContentArea = root[$extra].currentContentArea;
    const savedNoLayoutFailure = root[$extra].noLayoutFailure;
    if (this.overflow) {