https://bugs.kde.org/show_bug.cgi?id=425051

            Bug ID: 425051
           Summary: Debug logging and useless logging in system log by qt
                    and plasma5 programs
           Product: plasmashell
           Version: master
          Platform: Mageia RPMs
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: general
          Assignee: k...@davidedmundson.co.uk
          Reporter: aoude...@outlook.com
                CC: plasma-b...@kde.org
  Target Milestone: 1.0
             Flags: Wayland+, X11+

SUMMARY
Too many logging as warnings in journald system journal coming from QT and
Plasma 5 programs like this:

plasmashell[2223]:
file:///usr/share/plasma/packages/org.kde.paneltoolbox/contents/ui/main.qml:89:5:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated. Use this syntax inste>
plasmashell[2223]: Qt Quick Layouts: Detected recursive rearrange. Aborting
after two iterations.
plasmashell[2223]:
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Panel.qml:73:5:
QML Binding: Not restoring previous value because restoreMode has not been set.
                                                  This behavior is deprecated.
                                                  You have to import QtQml 2.15
after any QtQuick imports and set
                                                  the restoreMode of the
binding to fix this warning.
                                                  In Qt < 6.0 the default is
Binding.RestoreBinding.
                                                  In Qt >= 6.0 the default is
Binding.RestoreBindingOrValue.
plasmashell[2223]:
file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/views/Panel.qml:89:5:
QML Binding: Not restoring previous value because restoreMode has not been set.
                                                  This behavior is deprecated.
                                                  You have to import QtQml 2.15
after any QtQuick imports and set
                                                  the restoreMode of the
binding to fix this warning.
                                                  In Qt < 6.0 the default is
Binding.RestoreBinding.
                                                  In Qt >= 6.0 the default is
Binding.RestoreBindingOrValue.
plasmashell[2223]:
file:///usr/lib64/qt5/qml/QtQuick/Controls/Styles/Plasma/BusyIndicatorStyle.qml:39:9:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated.
plasmashell[2223]:
file:///usr/lib64/qt5/qml/QtQuick/Controls/Styles/Plasma/BusyIndicatorStyle.qml:39:9:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated.
plasmashell[2223]:
file:///usr/share/plasma/plasmoids/org.kde.plasma.taskmanager/contents/ui/Task.qml:285:5:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated.
kwin_x11[2180]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence:
57700, resource id: 37748869, major code: 18 (ChangeProperty), minor code: 0
kwin_x11[2180]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence:
58141, resource id: 18877318, major code: 3 (GetWindowAttributes), minor code:
0
kwin_x11[2180]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable),
sequence: 58142, resource id: 18877318, major code: 14 (GetGeometry), minor
code: 0
plasmashell[2223]:
file:///usr/share/plasma/plasmoids/org.kde.plasma.taskmanager/contents/ui/Task.qml:285:5:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated.
plasmashell[2223]:
file:///usr/share/plasma/plasmoids/org.kde.plasma.taskmanager/contents/ui/Task.qml:285:5:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated.
kwin_x11[2180]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence:
1124, resource id: 106954755, major code: 15 (QueryTree), minor code: 0
kwin_x11[2180]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence:
1129, resource id: 106954755, major code: 18 (ChangeProperty), minor code: 0
plasmashell[2223]:
file:///usr/share/plasma/plasmoids/org.kde.plasma.taskmanager/contents/ui/Task.qml:285:5:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated.
plasmashell[2223]:
file:///usr/lib64/qt5/qml/QtQuick/Controls/Styles/Plasma/ScrollViewStyle.qml:60:5:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated. Use this syntax inst>
plasmashell[2223]:
file:///usr/share/plasma/plasmoids/org.kde.plasma.notifications/contents/ui/FullRepresentation.qml:50:5:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated>
plasmashell[2223]:
file:///usr/lib64/qt5/qml/QtQuick/Controls/Styles/Plasma/ToolButtonStyle.qml:209:13:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated. Use this syntax in>
plasmashell[2223]:
file:///usr/lib64/qt5/qml/QtQuick/Controls/Styles/Plasma/ToolButtonStyle.qml:209:13:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated. Use this syntax in>
plasmashell[2223]:
file:///usr/lib64/qt5/qml/org/kde/plasma/extras/PlaceholderMessage.qml:189:
ReferenceError: string is not defined
plasmashell[2223]:
file:///usr/lib64/qt5/qml/QtQuick/Controls/Styles/Plasma/ToolButtonStyle.qml:209:13:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated. Use this syntax in>
plasmashell[2223]:
file:///usr/lib64/qt5/qml/QtQuick/Controls/Styles/Plasma/ToolButtonStyle.qml:209:13:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated. Use this syntax in>
plasmashell[2223]:
file:///usr/lib64/qt5/qml/QtQuick/Controls/Styles/Plasma/ScrollViewStyle.qml:60:5:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated. Use this syntax inst>
plasmashell[2223]:
file:///usr/lib64/qt5/qml/org/kde/plasma/components/TabButton.qml:102:5: QML
Connections: Implicitly defined onFoo properties in Connections are deprecated.
Use this syntax instead: funct>
plasmashell[2223]:
file:///usr/lib64/qt5/qml/org/kde/plasma/components/TabButton.qml:102:5: QML
Connections: Implicitly defined onFoo properties in Connections are deprecated.
Use this syntax instead: funct>
plasmashell[2223]:
file:///usr/lib64/qt5/qml/QtQuick/Controls/Styles/Plasma/ToolButtonStyle.qml:209:13:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated. Use this syntax in>
plasmashell[2223]:
file:///usr/lib64/qt5/qml/QtQuick/Controls/Styles/Plasma/ToolButtonStyle.qml:209:13:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated. Use this syntax in>
plasmashell[2223]: Qt Quick Layouts: Detected recursive rearrange. Aborting
after two iterations.
plasmashell[2223]: Qt Quick Layouts: Detected recursive rearrange. Aborting
after two iterations.
plasmashell[2223]: Qt Quick Layouts: Detected recursive rearrange. Aborting
after two iterations.
plasmashell[2223]:
file:///usr/lib64/qt5/qml/QtQuick/Controls/Styles/Plasma/ToolButtonStyle.qml:209:13:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated. Use this syntax in>
plasmashell[2223]:
file:///usr/lib64/qt5/qml/QtQuick/Controls/Styles/Plasma/ToolButtonStyle.qml:209:13:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated. Use this syntax in>
plasmashell[2223]:
file:///usr/lib64/qt5/qml/QtQuick/Controls/Styles/Plasma/ToolButtonStyle.qml:209:13:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated. Use this syntax in>
plasmashell[2223]:
file:///usr/lib64/qt5/qml/QtQuick/Controls/Styles/Plasma/ToolButtonStyle.qml:209:13:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated. Use this syntax in>
plasmashell[2223]:
file:///usr/lib64/qt5/qml/QtQuick/Controls/Styles/Plasma/ScrollViewStyle.qml:60:5:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated. Use this syntax inst>
plasmashell[2223]:
file:///usr/lib64/qt5/qml/QtQuick/Controls/Styles/Plasma/ToolButtonStyle.qml:209:13:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated. Use this syntax in>
plasmashell[2223]:
file:///usr/share/plasma/plasmoids/org.kde.plasma.devicenotifier/contents/ui/FullRepresentation.qml:107:5:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecat>
plasmashell[2223]:
file:///usr/share/plasma/plasmoids/org.kde.plasma.devicenotifier/contents/ui/FullRepresentation.qml:87:9:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecate>
plasmashell[2223]:
file:///usr/lib64/qt5/qml/QtQuick/Controls/Styles/Plasma/ScrollViewStyle.qml:60:5:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated. Use this syntax inst>
plasmashell[2223]:
file:///usr/lib64/qt5/qml/QtQuick/Controls/Styles/Plasma/ToolButtonStyle.qml:209:13:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated. Use this 
plasmashell[2223]:
file:///usr/lib64/qt5/qml/QtQuick/Controls/Styles/Plasma/ToolButtonStyle.qml:209:13:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated.
plasmashell[2223]:
file:///usr/lib64/qt5/qml/org/kde/plasma/extras/PlaceholderMessage.qml:189:
ReferenceError: string is not defined
kwin_x11[2180]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence:
5558, resource id: 58720273, major code: 18 (ChangeProperty), minor code: 0
plasmashell[2223]:
file:///usr/share/plasma/plasmoids/org.kde.plasma.taskmanager/contents/ui/Task.qml:285:5:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated.
kwin_x11[2180]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence:
10735, resource id: 56623143, major code: 18 (ChangeProperty), minor code: 0
kwin_x11[2180]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable),
sequence: 11775, resource id: 37748857, major code: 73 (GetImage), minor code:
0
kwin_x11[2180]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable),
sequence: 11776, resource id: 37748857, major code: 73 (GetImage), minor code:
0
kwin_x11[2180]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable),
sequence: 11777, resource id: 37748857, major code: 73 (GetImage), minor code:
0
kwin_x11[2180]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable),
sequence: 11778, resource id: 37748857, major code: 73 (GetImage), minor code:
0
kwin_x11[2180]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable),
sequence: 11779, resource id: 37748857, major code: 73 (GetImage), minor code:
0
plasmashell[2223]:
file:///usr/lib64/qt5/qml/org/kde/plasma/components/Highlight.qml:47:5: QML
Connections: Implicitly defined onFoo properties in Connections are deprecated.
Use this syntax instead: functi>
plasmashell[2223]: trying to show an empty dialog
kwin_x11[2180]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence:
13458, resource id: 37748865, major code: 18 (ChangeProperty), minor code: 0
kwin_x11[2180]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence:
13464, resource id: 37748866, major code: 18 (ChangeProperty), minor code: 0
plasmashell[2223]:
file:///usr/share/plasma/plasmoids/org.kde.plasma.taskmanager/contents/ui/Task.qml:285:5:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated.
kwin_x11[2180]: qt.qpa.xcb: QXcbConnection: XCB error: 3 (BadWindow), sequence:
15976, resource id: 18875164, major code: 3 (GetWindowAttributes), minor code:
0
kwin_x11[2180]: qt.qpa.xcb: QXcbConnection: XCB error: 9 (BadDrawable),
sequence: 15977, resource id: 18875164, major code: 14 (GetGeometry), minor
code: 0
plasmashell[2223]:
file:///usr/share/plasma/plasmoids/org.kde.plasma.taskmanager/contents/ui/Task.qml:285:5:
QML Connections: Implicitly defined onFoo properties in Connections are
deprecated.



STEPS TO REPRODUCE
1. Run Plasma 5.19.4
2. See warning level messages like mentioned above in a Konsole with
"journalctl -f"

These warning level messages are unnecessary for the end user, they can give
the feeling of a dysfunction.
They must not be logged at warning level but at a less important like notice or
debug.

SOFTWARE/OS VERSIONS
Operating System: Mageia 8
KDE Plasma Version: 5.19.4
KDE Frameworks Version: 5.72.0
Qt Version: 5.15.0
Kernel Version: 5.7.12-desktop-1.mga8
OS Type: 64-bit
Processors: 4 × Intel® Core™ i5-6600K CPU @ 3.50GHz
Memory: 15.6 Gio of RAM
Graphics Processor: GeForce GTX 1660 Ti/PCIe/SSE2

Workaround:
Add QT_LOGGING_RULES='*=false' as environment variable to change this
behaviour, e.g. to completely disable logging in /etc/environment

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