It happens only with the cursor-nodrop because it’s a PNG with size 20×20 and now the default image size in the theme is:
theme-1: 24×16 (because the SVG iconset 1 is based on fontawesome and the ratio is wider)
theme-2: 20×20 (the SVG iconset is based on icons8 and the icons have a sqare ratio and are a bit smaller)
theme-3: 18×18 (the SVG iconset is based on google material and the icons are a bit larger)
I’ll change the cursor-nodrop to 16×16 (don’t why it’s 20×20). The set the size of the icons on the button use the imagelist.
I think we should add a new property ImageSize to set the size on the specific control instead of having to either resize the image or use an imagelist components.