Bug 500338

Summary: QML SpinBox: Binding loop detected for property "implicitWidth": qrc:/qt/qml/org/kde/plasma/components/SpinBox.qml:20:5
Product: [Frameworks and Libraries] libplasma Reporter: hbr <nepnep>
Component: componentsAssignee: Plasma Bugs List <plasma-bugs-null>
Status: RESOLVED FIXED    
Severity: minor CC: nate, niccolo.venerandi, notmart
Priority: NOR    
Version First Reported In: 6.1   
Target Milestone: ---   
Platform: Arch Linux   
OS: Linux   
Latest Commit: https://invent.kde.org/plasma/libplasma/-/commit/c01eb1db8382c78f24313f700732ed3481005a6d Version Fixed/Implemented In: 6.4.0
Sentry Crash Report:

Description hbr 2025-02-18 19:07:50 UTC 
SUMMARY
Opening the panel configuration logs the following error messages to the journal:

plasmashell[1267]: file:///usr/share/plasma/shells/org.kde.plasma.desktop/contents/configuration/PanelConfiguration.qml:607:9: QML SpinBox: Binding loop detected for property "implicitWidth": qrc:/qt/qml/org/kde/plasma/components/SpinBox.qml:20:5

plasmashell[1267]: file:///usr/share/plasma/plasmoids/org.kde.panel/contents/ui/ConfigOverlay.qml:349:17: QML SpinBox: Binding loop detected for property "implicitWidth": qrc:/qt/qml/org/kde/plasma/components/SpinBox.qml:20:5

plasmashell[1267]: kf.plasma.quick: Exposed with no visual parent. Window positioning broken.

STEPS TO REPRODUCE
1. Open the panel configuration (e.g. right click on panel, click on "Show panel configuration")
2. Close the panel configuration
3. Check the journal

OBSERVED RESULT
The above error messages appears in the journal.

EXPECTED RESULT
No error happens / error message gets logged.

SOFTWARE/OS VERSIONS
Operating System: EndeavourOS 
KDE Plasma Version: 6.3.1
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2
Kernel Version: 6.13.2-arch1-1 (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 7800X3D 8-Core Processor
Memory: 30,9 GiB of RAM
Graphics Processor: AMD Radeon RX 7900 XTX
Manufacturer: ASRock
Product Name: X670E Steel Legend
Comment 1 cwo 2025-03-11 15:51:56 UTC 
Git commit c01eb1db8382c78f24313f700732ed3481005a6d by Christoph Wolk.
Committed on 11/03/2025 at 15:44.
Pushed by cwo into branch 'master'.

PC3/SpinBox: don't read implicitsize of loader before it's ready

Spinbox uses a Loader to conditionally load the editable or non-editable
version of the textinput background. The Loader coming in confuses the
implicit size assignment and leads to a binding loop for a moment before
settling on a proper value. This seems harmless, but causes a warning to
be printed each time a PC3 SpinBox is created.

Instead, just wait until the Loader is ready, and consider its implicit
size to be 0 until then.
FIXED-IN: 6.4.0

M  +2    -2    src/declarativeimports/plasmacomponents3/SpinBox.qml

https://invent.kde.org/plasma/libplasma/-/commit/c01eb1db8382c78f24313f700732ed3481005a6d