Overview of changes in 3.15.90
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* Bugs fixed:
711505 Documentation updates
731391 Sluggish next/previous buttons
731437 Port to GEGL 0.3
733213 Jerky transition when opening some photos from the grid
737990 icons: Use symbolics for HighContrast icons
743853 view-container: Use edge-reached signal instead of edge-overshot
744305 Add basic debugging infrastructure
744309 Remove use of deprecated gnome-common
744590 base-item: Silence -Waggregate-return
