[kfontview] [Bug 497116] New: Unable to open font on Wayland

[dantmnf]

https://bugs.kde.org/show_bug.cgi?id=497116

            Bug ID: 497116
           Summary: Unable to open font on Wayland
    Classification: Applications
           Product: kfontview
           Version: 6.2.4
          Platform: Arch Linux
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: dantmnf2+kdebugs at gmail.com
  Target Milestone: ---

SUMMARY
The kfontview and kcm_fontinst is broken (again) on Wayland

STEPS TO REPRODUCE
1. Start a Plasma Wayland session
2. Use kfontview to open a random font

OBSERVED RESULT

% kfontview /usr/share/fonts/noto/NotoSans-Regular.ttf
kf.xmlgui: cannot find .rc file "kfontviewpart.rc" for component
"kfontviewpart"
kf.kio.core: Url QUrl("file:///usr/share/fonts/noto/NotoSans-Regular.ttf")
already represents a local file, cancelling job.
X Error of failed request:  BadLength (poly request too large or internal Xlib
length error)
  Major opcode of failed request:  139 (RENDER)
  Minor opcode of failed request:  20 (RenderAddGlyphs)
  Serial number of failed request:  19
  Current serial number in output stream:  374

Similarly, the kcm_fontinst will crash kcmshell or systemsettings:
% systemsettings kcm_fontinst
Service  org.kde.fontinst  not registered, starting
"/usr/lib/kf6/kauth/fontinst"
qml: Page SubCategoryPage_QMLTYPE_130(0x5b61530315b0) is already in the PageRow
qml: Pushed pages do not conform to the rules. Please check the documentation.
qml: push (file:///usr/lib/qt6/qml/org/kde/kirigami/PageRow.qml:223)
onActiveSubCategoryRowChanged
(qrc:/qt/qml/org/kde/systemsettings/SubCategoryPage.qml:180)
X Error of failed request:  BadLength (poly request too large or internal Xlib
length error)
  Major opcode of failed request:  139 (RENDER)
  Minor opcode of failed request:  20 (RenderAddGlyphs)
  Serial number of failed request:  19
  Current serial number in output stream:  370


EXPECTED RESULT
kfontview opens a preview window

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: 
KDE Plasma Version: 6.2.4
KDE Frameworks Version: 6.8.0
Qt Version: 6.8.1

ADDITIONAL INFORMATION

With QT_QPA_PLATFORM=xcb, the preview window is correctly shown.

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