bug#45640: 28.0.50; Fringe icons show fixed white background on secondary display (macos)

[Li Feng]

Tested starting with "Emacs -q" then choose a builtin theme "wambat",
move the window to external display and I can still see the problem.

On Tue, Jan 5, 2021 at 11:42 AM Li Feng <li.feng@snap.com> wrote:
>
> Hi I just rebuilt everything with latest master branch, and I can
> still reproduce this problem.
> It shows in all themes, including builtin themes.
> I'm running on macos catalina 10.15.7.
>
> On Tue, Jan 5, 2021 at 2:46 AM Alan Third <alan@idiocy.org> wrote:
> >
> > On Mon, Jan 04, 2021 at 10:06:25AM +1100, Li Feng via Bug reports for GNU 
> > Emacs, the Swiss army knife of text editors wrote:
> > > 1. Use a dark theme (so that it's easier to see the incorrect background
> > > color)
> > >
> > > 2. Start Emacs on internal laptop display, and observe fringe icons
> > > (eg. new line indicators) are displayed correctly.
> > >
> > > 3. Drag the Emacs window to the external monitor, and observe the fringe
> > > icons are all displayed on white background instead of theme color.
> > >
> > >
> > > In GNU Emacs 28.0.50 (build 1, x86_64-apple-darwin19.6.0, NS
> > > appkit-1894.60 Version 10.15.7 (Build 19H15))
> > >  of 2020-12-18 built on C02C94JGMD6T
> > > Repository revision: fa4c2768cf6cf670e4c7af0c2b74ad139e65aad4
> > > Repository branch: master
> >
> > Hi, I can't replicate this. Can you please try building from current
> > master and checking if you still see this?
> > --
> > Alan Third