get_background_items - when is it used?

[Sunil Negi <vick ram79 yahoo com>]

Has anyone ever  seen this function being called?
I am writing an extension to mimic TortoiseSVN behaviour (for GIT).  I 
have never  seen this function being called.

I was under the impression that if files are selected and you right 
click, then get_file_items() is called. Otherwise when you simply right 
click without choosing a file then get_background_items() is called.

At various places it is reported that get_background_items() is called 
when the menu is invoked with the cursor in background. Does anyone even 
know what that means in plain english?

Sunil