The browsers have been choosing very poorly and have a lot of bugs when
it comes to favicons. Using an ICO makes many browsers choose better in
most cases. Most large websites use ICO files.
The icons in the ICO file needs to be ordered largest to the smallest
icon, and due to a Chrome bug we are limited to 8 icons. This
unfortunately means we couldn't fit one of the Android sizes. The 72x72
icon was removed since testing showed that it was used the least.
Instead of calculating a density that we hope results in the correct
size, we can specify what size we want. This is more robust and easier
to understand. This also allows us to simplify the Makefile quite a bit.
Note that Fedora's packaging of ImageMagick has a bug here:
https://bugzilla.redhat.com/show_bug.cgi?id=2140018
All of the icons are square, only providing the size in one direction is
enough. This change lets us avoid some unnecessary complexity in the
Makefile.
Apple requires a different set of icons now-a-days. This change involves
removing the 76x76 icon and adding icons with the following sizes;
40, 58, 80, 87, 167 and 180.
It is not a launcher icon, but rather used for display on Google
Play. As such it is not needed and removing it mitigates the issue
of some buggy browsers downloading each and every listed icon.
Samuel Mannehed
Pierre Ossman