**System:**
* Fedora 44, KDE Plasma 6.6.4
* KF6 Frameworks 6.25.0 / 6.26.0 (rebuilt locally)
* Qt 6.10.3
**Problem:** All widget and display configuration windows appear as blank/empty frames. Right-clicking any panel widget and selecting "Configure" shows only a window border with no content.
**Root Cause (after extensive debugging):** Qt 6.10.3 strictly enforces QML component versioning. The `activeValueChanged` signal on `DragHandler` was introduced with `Q_REVISION(6, 5)`:
/usr/include/qt6/QtQuick/6.10.3/QtQuick/private/qquickdragaxis_p.h:
Q_REVISION(6, 5) void activeValueChanged(qreal delta);
Kirigami's `DrawerHandle.qml` and `HandleButton.qml` use `onActiveValueChanged` signal handlers, but the Kirigami QML modules declare version `2.0` — older than Qt 6.5 when this signal was introduced. Qt 6.10.3 now rejects this with:
qrc:/qt/qml/org/kde/kirigami/templates/private/DrawerHandle.qml:73:17:
“.onActiveValueChanged” is not available due to component versioning.
This causes the entire `AppletConfiguration.qml` chain to fail:
AppletConfiguration.qml → Kirigami.ApplicationItem
→ AbstractApplicationItem → OverlayDrawer
→ KT.OverlayDrawer → DrawerHandle ← FAILS
**What was tried:**
* Downgrading Qt 6.10.3 → 6.10.2 (no fix, same issue)
* Reinstalling kf6-kirigami (no fix)
* Rebuilding kf6-kirigami 6.26.0 from source with patched QML syntax (no fix)
* Commenting out `prefer :/qt/qml/...` directives in all Kirigami qmldir files (no fix — AOT compiled into `.so`)
* Changing `OverlayDrawer 2.0` to `OverlayDrawer 6.5` in templates qmldir (no fix)
**Key finding:** The `onActiveValueChanged` handler is AOT-compiled into `libKirigamiControls.so` and `libKirigamiTemplates.so` via Qt's `qrc:/` resource system. Even after patching the source `.qml` files and rebuilding, Qt 6.10.3 rejects the signal handler due to module version mismatch. The fix likely requires either:
1. Updating Kirigami's QML module version declarations to 6.5+
2. Qt 6.10.3 reverting the strict component versioning enforcement
3. Replacing `onActiveValueChanged` with a non-versioned alternative
**Affected files:**
* `src/templates/private/DrawerHandle.qml` line 73
* `src/controls/private/globaltoolbar/HandleButton.qml` line 63