bug#9609: Excessive transient region highlighting with highlight-nonselected-windows

[Lars Ingebrigtsen]

Glenn Morris <rgm@gnu.org> writes:

> emacs -Q --eval '(progn (setq highlight-nonselected-windows t) 
> (transient-mark-mode -1))' -f make-frame
>
> Two frames open showing the *scratch* buffer, once frame has focus.
>
> With the mouse, click on the "n" of "notes" in the focused frame. Do
> not release the mouse. In the other frame, a region starting or ending
> at "n" is now selected.

I can confirm that this is still present in Emacs 28.

Pretty weird behaviour.

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   bloggy blog: http://lars.ingebrigtsen.no