Re: Unbalanced change hooks (part 2)

[Eli Zaretskii]

> Date: Tue, 9 Aug 2016 15:01:32 +0000
> Cc: address@hidden, address@hidden, address@hidden
> From: Alan Mackenzie <address@hidden>
> 
> My guess is that originally these hooks were _intended_ to be balanced
> (as they still are, at least to a very great extent, on XEmacs).  At
> some stage (probably in the late 1990s/early 2000s) optimisations were
> made in insdel.c and elsewhere, and the strict pairing of b-c-f and
> a-c-f got lost in the wash.

No, the 'prepare' argument was added in 1994 (Emacs 19.2x), and
starting from that change, the hooks were never balanced.  You can
clearly see that in the Git history output.