Subject: Re: bug#50798: 28.0.50; Tab line close button is off-center until it is highlighted with the mouse

From: Eli Zaretskii <[email-masked]>
Date: Sat, 25 Sep 2021 10:59:04 +0300

> Date: Sat, 25 Sep 2021 14:54:31 +0800
> From:  Po Lu via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <[email-masked]>
> 
> 
> The close button for each tab in a tab line is off-center unless it's
> under mouse face.

It probably has something to do with how the image spec in
tab-line-close-button is defined, specifically the margin and ascent
attributes.