Get info doesn't update size if contents changes

[humdinger]

This is hrev56578+22, 64bit.

I don't know if it's a regression or if it never worked, but it seems to me that it should:

• Create a new folder
• "Get info" on it
• Copy some file into it

-> Still shows a size of 0 bytes.

If you monitor some file being downloaded with the "Get info" panel, size gets updated alright.