[Merge] lp:~fboucault/ubuntu-ui-extras/fix_exif_orientation into lp:ubuntu-ui-extras

[Florian Boucault]

The proposal to merge lp:~fboucault/ubuntu-ui-extras/fix_exif_orientation into lp:ubuntu-ui-extras has been updated.

Commit Message changed to:

When rotating pictures during edit, write the EXIF orientation tag with the right type (unsigned short) instead of signed long.
PhotoImageProvider: change its behaviour to only rectify the EXIF orientation tag type when necessary (removes all other behaviours: caching, etc.)

For more details, see:
https://code.launchpad.net/~fboucault/ubuntu-ui-extras/fix_exif_orientation/+merge/257782
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