I have two almost identical file names in vifm panel like:
LongFileNameIn|Panel
LongFileNameIn|ThisPanel
where | is a border of a panel. I wonder if there is a way to display file full name in some status line or other view.
If terminal width is enough, you can sacrifice other information in status line and display only file name there by changing 'statusline' option:
set statusline=%t
You could also switch to single pane mode when working with such files using :only command.
If whole width isn't enough and this is rare case, name could be echoed on the status bar at request (easy to map to some shortcut):
:echo expand('%"c')
As many elements are displayed one per line, there is actually no universal way of displaying very long file names that do not fit into screen.