Bug#1132566:

[Nilson Silva]

Hi Christopher, Elena, Christoph,

I have pushed a small refinement to the patch on salsa. The changes are:

- Cache moved to `__init__`: bytes from file-like sources are now stored at construction time, not lazily on first save. This closes the window where a second save could fail if the handle was closed before any save occurred.
- Format conversion fix: replaced `img.format or "png"` with `self.format` in the fallback path, preventing silent JPEG/GIF-to-PNG conversion.
- `except Exception` narrowed to `except OSError` on `fp.close()`.

Both the original and refined patch pass all 10 tests; unpatched 3.1.5 fails on the two BytesIO double-save cases as expected.

Also, Alexandre Detiste has granted me upload rights for this package, so I can upload directly if everyone is happy with the patch.

Cheers,
Josenilson
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