Alexandre Janniaux authored Jan 23, 2023 and Tristan Matthews committed Jan 25, 2023

The picture was referenced on the ThumbnailerCtx object, which release
it whenever one is not nullptr. However, after the changes in !3088,
commit 2ea2c7eb, the release policy for
the picture being exported has been fixed to ensure the picture is
consumed whatever the conversion case.

Ensure the picture won't be released twice by swapping it from the
ThumbnailerCtx object before exporting.

Fix #27749