Is this just  issue 834775 ? We are not currently loading DisplayPrefs correctly on startup in 68 (due to https://chromium-review.googlesource.com/c/chromium/src/+/1003379)

I am investigating fixes, hoping to avoid another revert.

Re #0 and #1, this bug also happens on m67: 67.0.3396.16, so it is not a regression from  issue 834775 .

OK, so something different, oh joy :)

+msw@ just in case this is mustash related.

Yeah, this only seems to repro if #mus is enabled in about:flags.
Evan, could this be related to Mus' general window positioning?

Otherwise, maybe the external display is being destroyed before closing the window or not initialized before we recreate the window, so it's placed on the internal display as a fallback.

Either way, we're putting the current window service incarnation on hold for now.
This shouldn't reach any release channels (it's only on for local dev builds).
We can reduce priority here for now, and circle back later.

Is mus enabled on tot + dev build?

Yes

I believe it's this TODO: https://cs.chromium.org/chromium/src/services/ui/ws/window_tree.cc?rcl=6307cee92c0244840864eefd8d1f6f0c21832185&l=1618

The new window service as a library will need to solve this before launching.

msw@ who is working on new window service as a library?

sky@ is leading the effort with support from jamescook@, estade@, stevenjb@, and myself.

This isn't a blocker for 837684, but definitely is something we need to resolve before the browser can convert to WindowService. 847992 is likely a better bug to have this blocking.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/215736ef840b1d6fb28e57a10fcd38ebc2a617ec

commit 215736ef840b1d6fb28e57a10fcd38ebc2a617ec
Author: Evan Stade <estade@chromium.org>
Date: Tue Sep 04 21:40:12 2018

Mash: place windows on correct displays during session restore.

Bug: 836449
Change-Id: Ic69bffc92dc7a033ae970e81399f16dd0cd64260
Reviewed-on: https://chromium-review.googlesource.com/1205010
Reviewed-by: James Cook <jamescook@chromium.org>
Commit-Queue: Evan Stade <estade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#588645}
[modify] https://crrev.com/215736ef840b1d6fb28e57a10fcd38ebc2a617ec/ash/wm/top_level_window_factory.cc