bug#41338: Toolbar-bug in Emacs 27.0.91/Pretest

[Eli Zaretskii]

On May 17, 2020 12:11:04 PM GMT+03:00, Stephen Berman <stephen.berman@gmx.net> 
wrote:
> On Sun, 17 May 2020 10:56:50 +0200 Stephen Berman
> <stephen.berman@gmx.net> wrote:
> 
> > On Sun, 17 May 2020 10:20:55 +0200 martin rudalics <rudalics@gmx.at>
> wrote:
> >
> >>> But I don't know why the ‘delete-frame’ event is not fired on
> frame deletion.
> >>
> >> How do you delete the frame?  You don't get a 'delete-frame' event
> when
> >> you delete a frame via C-x 5 0 or C-x 5 1.
> >>
> >> martin
> >
> > In my test I followed the OP's recipe:
> >
> >> (7) Using the mouse, close the frame showing mouse.el, but do so in
> a state
> >> where still isearch overlays show up.
> >
> > I.e., I clicked on the 'X' (close frame button) in the frame's title
> > bar.
> 
> But when I close the frame with `C-x 5 0' instead and then proceed
> with
> the OP's recipe, the tool bar does not change and when I switch to the
> buffer where isearch had been invoked, the search is now abandoned,
> i.e., no isearch tool bar or lighter, no overlays.  So only closing
> the
> frame by clicking the close frame button with the mouse induces the
> surprising behavior.
> 
> Steve Berman

Could someone please explain to me what is deemed to be the bug here?  Because 
I'm confused wrt what is the part of the original description that seems to be 
the problem.  In particular, the Isearch overlays are per-window, AFAIK.