2 years later… and a bit.
Same bug.
Ctrl +Z undoes in the Active Styles panel (where something was deleted) and restores it there,
but FAILS to restore it in the actual css sheet Im editing.
I thought this had been fixed.
ITs done it in some other places I cant find too, so this tutorial is taking quite a while, as things arent working and i now have missing code in style sheet.
OK enough attempts at finishing this tonight,
have another bug report, or the same bug report from before, or… a distant, near , relative to that bug.
NB, in fact Im not even sure what happens when I enter the mouse in the style code editor page and click it.
The large ampersand reappears after hitting Ctrl + Z and it is restored in design view and active styles panel,
but… then dissapears when I click the actual styles code view, where I want to past it back in,
then reappears when I paste it.
Not sure why it dissapears when I click the code editor view of the stylesheet.
Ive checked the other info on this too (quite a lot about this bug)
Ie,
I totally forgot about that split history undo thing in 5.97 update.I was looking for the option somewhere.
That is a pain.
SO if you’re following a PG tutorial… using pinegrow… and make a mistake.
You’re goosed. 
MMMm, so what is the current best way forward?
I’ll try that then, but I actually like the PG editor etc and the way it works and seperate element code view, full page and stylesheet.
its really good!
But man!
this bug… its a killer.
Ok, checking out the Combined History icon… id forgotton about that altogether.
Thats a bit tricky to work out too, but not too bad I think.
but what does it actually DO?
I see orange for css edits
And blue for HTML edits, so I guess I just click backwards until things seem ok, before I got my pudgy fingers on the wrong keys 
Ok, Ctrl +z is damned convenient but this has improved.
I remember using this and once you went back (possibly too far back, to the wrong place) and then clicked one of those edits… you immediately lost all the following undo history… which…was
not…nice…
If you’d gone back too far.
lets go clicky!
ah, this might be ok, lets try and start using this then.
Ill check for some docs on this combined history, undo tool thing tmrw