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The video in Totem does not scale in multi screen Wayland + HiDPI

Steps to reproduce

  1. Hardware configuration: Dell XPS 15 9550 with UHD screen (3840x2160px); dual full HD screen (16/10 - 1920x1200px) via thunderbolt 3 adapter dual Displayport
  2. Software configuration: Debian Sid with GNOME 3.30.1; Totem 3.26.2-1; Wayland; UHD screen in HiDPI mode 200%, other screen in 100%
  3. Just play a video (720x304px) with Totem

Current behavior

When I play a video on the UHD screen (in center), the video only takes a quarter of the window (it is not scaled) as in the following screenshot:

Capture_d_écran_du_2018-11-02_10-28-58

But when I read it on one of the two screens in 100%, it behaves normally and occupies all the space:

Capture_d_écran_du_2018-11-02_10-31-01

This bug also occurs when the window is not maximized.

Expected behavior

To reproduce this bug, it is enough to launch a video with Totem under GNOME 3.30.1 with Debian Sid on a PC in HiDPI with screens having a different definition and not scaled under Wayland.

I think this is because scaling does not apply to Totem when at least one screen has not enabled it (the 100% applies to the application can matter on which screen she is).

Additional information

Debian Sid. I am French. Not tested in Flatpak.