This feature would very easily allow a person to see how many matched results the search has - and on which line numbers the search is matched on.
Here is a screenshot example of such (from Trianglos Keynote):
Requirements:
1. User could show and hide the search panel via a hotkey such as Ctrl+Shift+F.
2. Upon pushing Ctrl+Shift+F, the search panel would become visible with keyboard caret active on search field.
3. When pushing enter - it would search in all currently open documents and show results in a list. Each result would show the file in which it was found and its line number.
4. Clicking on any of the search results in the list would jump to that line number in that document.