PDFForm.flatten() does not handle rotated fields correctly #733
Description
PDF form fields can be rotated. However, the rotation logic for form field widgets should be "in-place" (see rotateInPlace), as opposed to the more common (at least in PDF land) logic of "about-the-origin" rotation. The current logic used in PDFForm.flatten() appears to be using "about-the-origin" logic, which leads to incorrect results after flattening a rotated field. See below for examples clarifying this:
✅ Correct Rendering of Rotated Fields
You can generate this document yourself by running yarn apps:node 17 and looking at the first page of the resulting document.
❌ Incorrect Rendering of Rotated Fields
You can generate this document yourself by running yarn apps:node 18 and looking at the fifth page of the resulting document.
