Contextual history backtracking for only selected texts leaving history of other text intact

Let say you have some text

-----------------------------------------------

1| psudo code {

2|  function of complexity 

3|   lots of code that i need to make lots of changes to 

4| }

5|

6| some other stuff that gets edited in between edits

7| of my psudo function

8|

9|

I want to be able to select my psudo code text block and (crtl/cmd)+z only its history leaving the state of my other code intact.

I understand it is a very complex problem to solve but It would be unbelievably useful and a great time saver.