[BetterRed]

I use the extra_data_files function to show a folder icon:

program:
	if has_extra_files()
		then 'folder.png'
	else
		'transparent_square.png'
	fi

I have a library of 8,473 books, 2,951 (~35%) books have non-empty 'data' folders (there are probably a few hundred empty ones, I don't bother removing empty data folders). The library is on a 7,200 rpm SATA III (6.0Gb/s) HDD.

Because it's a wet cold Sunday morning, I removed the rule. I cannot discern any noticeable difference when hitting page down on the book list (48 lines per page), it is more or less instantaneous with or without the 'has_extra_files' column icon rule.

BR