https://bugs.kde.org/show_bug.cgi?id=476950
Bug ID: 476950
Summary: KSortFilterProxyModel::filterRole & filterRoleName
properties are buggy
Classification: Frameworks and Libraries
Product: frameworks-kitemmodels
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kdelibs-b...@kde.org
Reporter: m...@ratijas.tk
Target Milestone: ---
Created attachment 163125
--> https://bugs.kde.org/attachment.cgi?id=163125&action=edit
ksortfilter-bug.qml
SUMMARY
KSortFilterProxyModel exhibits "race condition" bug: depending on order of
property initialization (which isn't quite defined in QML, except that more
"complex" expressions are known to evaluate later than the simple literals and
enums), it may end up with filterRole reset to 0 (thus the whole filtering not
working, as currently in Flatpak KCM -> application list), or a model emits
inappropriate rowsAdded signal which causes a view (e.g. ListView) to create a
phantom and empty delegate which won't even ever be deleted.
STEPS TO REPRODUCE
1. Run the attached file with qml or kqml tool. It uses plasma-pa/SinkModel as
an example, so make sure you have some functional speakers/headphones or
replace it with some other model.
2. Type in anything in the search field.
3. Toggle ON the "Set model" check box.
4. Click the "Set filter role" button.
5. Clear the search field.
OBSERVED RESULT
After step 4, an empty delegate appears in the ListView.
After step 5, an empty delegate remains alive at the bottom of the list of your
audio devices.
EXPECTED RESULT
No empty glitched delegates. No races between filterRole and model properties.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.81.0
KDE Frameworks Version: 5.245.0
Qt Version: 6.6.0
Kernel Version: 6.6.1-arch1-1 (64-bit)
Graphics Platform: X11
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