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.
if (this.caption && ["top", "bottom"].includes(this.caption.placement)) {
        captionHeight = this.caption.reserve;
        if (captionHeight <= 0) {
          captionHeight = this.caption[$getExtra](availableSpace).h;
        }
        const inputHeight = this.h - captionHeight - marginV - borderDims.h;
        ui.children[0].attributes.style.height = measureToString(inputHeight);
      } else {
        ui.children[0].attributes.style.height = "100%";
      }
    }
    if (!caption) {
      if (ui.attributes.class) {
        
        ui.attributes.class.push("xfaLeft");
      }
      this.w = savedW;
      this.h = savedH;
      return HTMLResult.success(createWrapper(this, html), bbox);
    }
    if (this.ui.button) {
      if (style.padding) {
        delete style.padding;
      }
      if (caption.name === "div") {
        caption.name = "span";
      }
      ui.children.push(caption);
      return HTMLResult.success(html, bbox);
    } else if (this.ui.checkButton) {