Text in the Quick Find and potentially the Find Window that shows the index match count. That is to say it will show both the total matches and the current match number.

For example, it may show up as something like "3 of 9 matches" or "Found next match [3/9]".

Also potentially have a setting to only enable this feature for text files under custom set number of lines/characters (assuming this would help prevent slow down on big files).