bug#42914: [PATCH] Fixed indentation and mix used of space and tabs.

[Eli Zaretskii]

> From: Jen-Chieh Shen <jcs090218@gmail.com>
> Date: Tue, 18 Aug 2020 22:02:43 +0800
> 
> When I am editing the file `lisp/window.el` I found some indentation issues 
> and mixed use of space and tab.

Thanks, but we prefer not to make whitespace-only changes, they make
repository forensics harder.  Instead, we fix whitespace where other
changes are being made.

> Is there a specific reason that these issues exist?

History.