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.
return false;
    }
    if (this[$extra]._isSplittable !== undefined) {
      return this[$extra]._isSplittable;
    }
    if (this.layout === "position" || this.layout.includes("row")) {
      this[$extra]._isSplittable = false;
      return false;
    }
    if (this.keep && this.keep.intact !== "none") {
      this[$extra]._isSplittable = false;
      return false;
    }
    if (
      parent.layout &&
      parent.layout.endsWith("-tb") &&
      parent[$extra].numberInLine !== 0
    ) {
      
      
      
      
      
      
      return false;
    }
    this[$extra]._isSplittable = true;
    return true;
  }
  [$toHTML](availableSpace) {