Bug#1114550: kde-plasma-desktop: "No Windows" when clicking on an task in the KDE task manager with "Shows large window previews" and replicating another screen

[Guillermo <guillermo@lopezalejos.es>]

Package: kde-plasma-desktop
Version: 5:162
Severity: minor

Dear Maintainer,

I found the following problem after upgrading from Debian Bookworm to Debian
Trixie.

STEPS TO REPRODUCE / PRECONDITIONS
* A system with two screens (in the case that I tested, a laptop and an HDMI
display).
* One screen replicates the other (in my case, the HDMI display replicated the
laptops built-in screen).
* "Icons-Only Task Manager widgets" configured with behavior "Shows large
window previews".
* There is an application with more than one windows open (for example, several
Firefox windows).

OBSERVED RESULT

Clicking on the application's icon shows previews for all windows in one of the
screens (the built-in screen in my case), and shows "No Windows" in the other
(the HDMI display).

EXPECTED RESULT

Clicking on the application's icon is expected to show the same previews for
all windows, in the replicated screen and the replicating screen.


-- System Information:
Debian Release: 13.0
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.12.41+deb13-amd64 (SMP w/8 CPU threads; PREEMPT)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages kde-plasma-desktop depends on:
ii  kde-baseapps      4:24.12.0+5.162
ii  plasma-desktop    4:6.3.6-1
ii  plasma-workspace  4:6.3.6-2
ii  udisks2           2.10.1-12.1+deb13u1
ii  upower            1.90.9-1

Versions of packages kde-plasma-desktop recommends:
ii  kde-inotify-survey                 25.04.0-1
ii  kwin-x11                           4:6.3.6-1
ii  libpam-fprintd                     1.94.5-2
ii  sddm                               0.21.0+git20250502.4fe234b-2
ii  webext-plasma-browser-integration  6.3.4-2
ii  xserver-xorg                       1:7.7+24

Versions of packages kde-plasma-desktop suggests:
ii  kdeconnect  25.04.2-1

-- no debconf information