Subject: bug#46257: 28.0.50; use flat-button in modus-operandi theme

From: Juri Linkov <[email-masked]>
Date: Wed, 03 Feb 2021 19:22:24 +0200

> This diff provides an example for the use of the :style flat-button in the
> tab-line

BTW, there are two possible contrasted styles for tab-line:

1. the active tab is lighter than inactive tabs;
2. the active tab is darker than inactive tabs.

For example, some desktop environments use the second style,
but currently Emacs tabs by default use the first style.

I'm not sure which one is better.