bug#51782: 28.0.60; Certain popup menus don't respect margin

[Eli Zaretskii]

> Date: Fri, 12 Nov 2021 09:01:51 +0800
> From:  Po Lu via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> 
> On X, go to an Info buffer with `left-margin-width' set to, for example,
> 50.  Then make sure the margin is actually updated in the window
> displaying the Info buffer (such as by calling `set-window-buffer').
> 
> Any C-down-mouse-3 will display a menu offset to the left by
> `left-margin-width' from where it should actually be.

Also, if you turn ON tab-line-mode, you will see an offset of 1 line.
A very old bug.  Should be fixed now on the master branch.

Thanks.