Freedesktop & Mac OS X could store cache in a better place according to spec

Feature
1

It would be more nice to store the cache database under, because when backup of the settings and certificates the whole cache is also stored:

See Apple specification: https://developer.apple.com/library/mac/documentation/FileManagement/Conceptual/FileSystemProgrammingGuide/MacOSXDirectories/MacOSXDirectories.html

$HOME/Library/Caches/net.syncthing.Syncthing/<database>

For systems who implement XDG Base Directory Specification it could be under:

$XDG_CACHE_HOME
If $XDG_CACHE_HOME is either not set or empty, a default equal to $HOME/.cache should be used.

See spec: http://standards.freedesktop.org/basedir-spec/basedir-spec-latest.html

2

It’s not really a cache though; deleting it has possibly significant negative effects.

3

Contains cached data that can be regenerated as needed. Apps should never rely on the existence of cache files

Yeah Syncthing’s home dir doesn’t match that. If anything, Syncthing requires Application Support