#1: Searching in the history in a file.
For example, open backup history for "foo.cpp"
search for "blat"
The results would show which versions "blat" is found - ideally in a tree form.
Search for "blat" ...
+Appears in version 10 thru current.
+Current version (12) 3 times
500 28: dfklsjflkjsdfljsf blat lksdljsdklslf
639 28: bbbbn blat lksdljsdklslf
788 28: aaaa blat lksdljsdklslf
+Version 11 2 times
488 28: dfklsjflkjsdfljsf blat lksdljsdklslf
700 28: aaaa blat lksdljsdklslf
+ Version 10
+Appears in versions 2 thru 5.
+ Version 5
+ Version 4
+ Version 3
+ Version 2
#2: "git blame" like display.