Apparently overlays have a "window" property, which when set, will display the overlay only in the relevant window.

I've noticed however that sometimes it gets set to t.

On Mon, Mar 11, 2013 at 8:59 PM, Eli Zaretskii <eliz@gnu.org> wrote:

> From: Tassilo Horn <tsdh@gnu.org>
> Cc: esabof@gmail.com, monnier@iro.umontreal.ca, 13887@debbugs.gnu.org

> Date: Mon, 11 Mar 2013 21:27:16 +0100

>
> So the multiple overlays thingy is actually intended. But somewhere the
> logic goes wonky and we're acting on the wrong overlay.

What is the "right" overlay?