Please describe the problem:
for the size of files there exist two different units:
-SI prefixes    
  multiple of 10, 10^3=kilo, 10^6=mega etc
-Binary prefixs
  multiple of 2 kibi (Ki)=2^10, mebi(Mi)=2^20

for example I got a file here that has a size of 18763826 bytes.
in MB (SI Prefix) this would be: (18763826bytes)/10^6 = 18,76 MB
in MiB(binary Prefix this would be (18763826bytes)/2^20 = 17.894578934 MiB

however this is what nautilus displays: 17.9 MB (18763826 bytes)
which is wrong!
it divdes through 2^20 but uses the SI Prefix.
There would be two possibilities solving this:

17.9 MiB (18763826 bytes)    -> Change MB to MiB
18,76 MB MiB (18763826 bytes) -> use 10^6 instead of 2^20
this is of course not only a problem with mega/mebi but all other unit prefixes, too.(kilo/kibi etc.)




Steps to reproduce:
1. 
2. 
3. 


Actual results:


Expected results:


Does this happen every time?


Other information: