bug#53294: 29.0.50; Indirect font changes incorrectly affecting original buffer

[Eli Zaretskii]

> From: Andrew Hyatt <ahyatt@gmail.com>
> Cc: 53294@debbugs.gnu.org
> Date: Sun, 16 Jan 2022 09:43:16 -0500
> 
> Yes, the non-nil CLONE argument is essential to reproduce. But 
> that just means the indirect buffer will inherit the state from 
> the direct buffer.  It doesn't imply that changes made to the 
> indirect buffer's state will affect the original buffer, which is 
> what is happening here.

But "inheriting" the state means the indirect buffer gets the copy of
the variables of the original buffer, and that is not a deep copy,
AFAIU.

Stefan, any comments on this issue?