Bug#989511: /usr/bin/sddm-greeter: Journal warnings about Implicitly defined onFoo properties in Connections are deprecated

[Tia]

Package: sddm
Version: 0.19.0-3
Severity: normal
File: /usr/bin/sddm-greeter
X-Debbugs-Cc: tia...@protonmail.com

Dear Maintainer,

Since installing Bullseye sddm-greeter started reporting warnings to the journal

lip 02 03:57:40 sddm-greeter[20366]: QFont::fromString: Invalid description '(empty)'
lip 02 03:57:40 sddm-greeter[20366]: file:///usr/lib/x86_64-linux-gnu/qt5/qml/SddmComponents/LayoutBox.qml:35:5: QML Connections: Implicitly defined onFoo properties in Connections are deprecated. Use this syntax instead: function onFoo(<arguments>) { ... }

Seems it is a change in QT syntax for connections.
https://stackoverflow.com/questions/62297192/qml-connections-implicitly-defined-onfoo-properties-in-connections-are-deprecat

Simmilary in qt-5 manual
https://doc.qt.io/qt-5/qml-qtqml-connections.html

It doesn't seem to impact functionality.

-- System Information:
Debian Release: 11.0
APT prefers testing-security
APT policy: (500, 'testing-security'), (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.10.0-7-amd64 (SMP w/4 CPU threads)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=en_US:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages sddm depends on:
ii adduser 3.118
ii debconf [debconf-2.0] 1.5.75
ii libc6 2.31-12
ii libgcc-s1 10.2.1-6
ii libpam0g 1.4.0-7
ii libqt5core5a 5.15.2+dfsg-5
ii libqt5dbus5 5.15.2+dfsg-5
ii libqt5gui5 5.15.2+dfsg-5
ii libqt5network5 5.15.2+dfsg-5
ii libqt5qml5 5.15.2+dfsg-5
ii libqt5quick5 5.15.2+dfsg-5
ii libstdc++6 10.2.1-6
ii libsystemd0 247.3-5
ii libxcb-xkb1 1.14-3
ii libxcb1 1.14-3
ii qml-module-qtquick2 5.15.2+dfsg-5
ii x11-common 1:7.7+22
ii xauth 1:1.1-1
ii xserver-xorg [xserver] 1:7.7+22
ii xvfb [xserver] 2:1.20.11-1

Versions of packages sddm recommends:
ii haveged 1.9.14-1
ii libpam-systemd 247.3-5
ii sddm-theme-debian-maui [sddm-theme] 0.19.0-3

Versions of packages sddm suggests:
ii libpam-kwallet5 5.20.5-1
pn qtvirtualkeyboard-plugin <none>

-- debconf information:
sddm/daemon_name: /usr/bin/sddm
* shared/default-x-display-manager: sddm

[a...@prnet.info]

I am seeing the same issue:

Sep 16 08:44:19 sddm-greeter[1596]: QFont::fromString: Invalid
description '(empty)'
Sep 16 08:44:19 sddm[1448]: Message received from greeter: Connect
...
Sep 16 08:44:19 sddm-greeter[1596]: Loading
file:///usr/share/sddm/themes/debian-theme/Main.qml...
Sep 16 08:44:19 upowerd[1672]: did not recognise USB path
/sys/devices/platform/USBC000:00/power_supply/ucsi-source-psy-USBC000:001,
please report
Sep 16 08:44:19 sddm-greeter[1596]:

file:///usr/lib/x86_64-linux-gnu/qt5/qml/SddmComponents/LayoutBox.qml:35:5:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated. Use this syntax instead: function on>

...
Sep 16 08:44:30 sddm-helper[2373]: [PAM] Conversation with 1 messages
Sep 16 08:44:30 sddm-helper[2373]: gkr-pam: unable to locate daemon
control file
Sep 16 08:44:30 sddm-helper[2373]: gkr-pam: stashed password to try
later in open session
Sep 16 08:44:30 sddm-helper[2373]: [PAM] returning.
Sep 16 08:44:30 sddm-helper[2373]: pam_kwallet5(sddm:auth): (null):
pam_sm_authenticate
Sep 16 08:44:30 sddm[1448]: Authenticated successfully
Sep 16 08:44:30 sddm-greeter[1596]: Message received from daemon:
LoginSucceeded

Debian (11, Bullseye) up to date, kernel 5.10.0-18-amd64, KDE desktop:
5.20.5, qt 5.15.2

What needs to be done to get rid of this, to fix this?