The 32x32 size can be created by downsampling the 48x48
icon by gtk at runtime but the result will be worse than
doing the same directly from the svg icon (48->32
conversion means downsampling by 1.5 which can introduce
some moire artifacts and loss of information). Since
32x32 are quite commonly used, it makes sense to ship
this icon size with Geany.

The png files have been optimized by pngoptim to remove
metadata and compress the icon better.