Completion of filenames - omit the './' when not needed

Where a filename is being completed as an argument of a command, the initial './' is not necessary and can be distracting. An option to omit the ./ would be useful.

Having the ./ when completing a command name is useful, because Powershell doesn't run commands in the current directory by default (maybe omit the ./ there as well if '.' is in $env:PATH?)
