[FEATURE][composer] Implement different resize modes for composer picture items, including zoom, stretch, clip, frame to image size (fix #7886). (Sponsored by City of Uster, Switzerland)
[composer] Move composer picture related tests into their own seperate test suite (sponsored by City of Uster, Switzerland)
[composer] Add tests for picture resize modes (sponsored by City of Uster, Switzerland)
[composer] Picture item header improvements (sponsored by City of Uster, Switzerland)
[composer] Add a featureChanged signal for when the current atlas feature changes (sponsored by City of Uster, Switzerland)
[FEATURE][composer] Add expression support for picture source (sponsored by City of Uster, Switzerland)
[composer] Don't resize picture frame to invalid sizes (sponsored by City of Uster, Switzerland)
[composer] Move code responsible for updating labels from atlas to QgsComposerLabel, fix potential crash when removing atlas coverage layer.
[composer] Add signal for when composition print resolution changes (sponsored by City of Uster, Switzerland)
[composer] Refresh picture size if composition resolution changes (sponsored by City of Uster, Switzerland)
[composer] Add tests for expression based picture source (sponsored by City of Uster, Switzerland)
[composer] Update picture item header documentation and sip bindings (sponsored by City of Uster, Switzerland)