Performance Improvements (PI)
- optimize _decode_png_prediction (2068)
Bug Fixes (BUG)
- Fix incorrect tm_matrix in call to visitor_text (2060)
- Writing German characters into form fields (2047)
- Prevent stall when accessing image in corrupted pdf (2081)
- append() fails when articles do not have /T (2080)
Robustness (ROB)
- Cope with xref not followed by separator (2083)
[Full Changelog](https://github.com/py-pdf/pypdf/compare/3.15.0...3.15.1)