in ~ (home) - I see .arduino , .arduino15 and then I have the "Arduino" directory, with a few different versions and projects.
The "Arduino" is synced between a few computers using "resillio sync", I have not been aware of the .arduino15 used for compilation, and not synced it.
What kind of mess may I be in now ? - are some components of that directory updated on one system, not the others ?
in linux, that is .arduino15. the . at the front makes it hidden in linux
this is where arduino keeps its preferences file for versions of Arduino IDE > 1.5. they changed the format, so they changed the file name, so Arduino IDE > 1.5 will not get invalid info from an outdated file
so if I syncronize only Arduino directory, but not .arduino15 or .arduino
... will I end up in some sort of hell where Arduino thinks a board is updated, but it is updated on only one computer ?
or will same update be offered for each computer ? (san't say to have seen this so far)