With 170533.v2.patch the thumbnails don't seem to have a fixed ratio (1:1) anymore (they scale in x and y direction differently, to fill the reserved size of the preview image with the current extent of the content of the layer).
With 170533.v2.patch the thumbnails don't seem to have a fixed ratio (1:1) anymore (they scale in x and y direction differently, to fill the reserved size of the preview image with the current extent of the content of the layer).