Popup/dialogs spawn at incorrect position if 'Native panel background' is disabled in Plasma 6.2 Beta

[luisbocanegra]

[luisbocanegra]

Well turns out popups now align with the panel mask https://invent.kde.org/plasma/libplasma/-/merge_requests/1148.

Setting PlasmaCore.Types.NoBackground to the panel containmentItem https://github.com/luisbocanegra/plasma-panel-colorizer/blob/b284edbb89a335476418cf631d1a72d408c07c19/package/contents/ui/code/utils.js#L84C1-L88C2

function toggleTransparency(containmentItem, nativePanelBackgroundEnabled) {
  containmentItem.Plasmoid.backgroundHints = !nativePanelBackgroundEnabled
    ? PlasmaCore.Types.NoBackground
    : PlasmaCore.Types.DefaultBackground
}

results in the panel creating an empty mask https://github.com/KDE/plasma-workspace/blob/c809de7c72dcc7e94eeed5a0b09cb81f5512c2e0/shell/panelview.cpp#L1363C1-L1366C28

void PanelView::updateMask()
{
...
    if (m_backgroundHints == Plasma::Types::NoBackground) {
        KWindowEffects::enableBlurBehind(this, false);
        KWindowEffects::enableBackgroundContrast(this, false);
        setMask(QRegion()); // <- this line

Which successfully removes the blur and contrast (allowing the panel to be fully transparent) but breaks the positioning of popups.

If I don't set PlasmaCore.Types.NoBackground and instead try to create an empty mask from my PanelColorizer::updatePanelMask, the panel detects it's empty and creates its own from the panel QRect instead:

    } else {
        QRegion mask;
        QQuickItem *rootObject = this->rootObject();
        QRect screenPanelRect = geometry();
        screenPanelRect.moveTo(mapFromGlobal(screenPanelRect.topLeft()));
        if (rootObject) {
            QVariant maskProperty = rootObject->property("panelMask");
            if (static_cast<QMetaType::Type>(maskProperty.typeId()) == QMetaType::QRegion) {
                mask = get<QRegion>(std::move(maskProperty));
                const QPoint floatingTranslucentItemOffset = rootObject->property("floatingTranslucentItemOffset").toPoint();
                mask.translate(floatingTranslucentItemOffset);
            }
        }
        if (mask.isEmpty()) {
            mask = QRegion(QRect(screenPanelRect));
        }

Creating a 1x1 mask and setting the correct position fixes the popups but now there is a bright dot on the screen and it will require compiling the C++ plugin.

region = QRegion();
translateX = abs(offset.x());
translateY = abs(offset.y() + rect.height() - 1);

Screencast_20241004_223204.webm

[luisbocanegra]

Upstream Bugreport https://bugs.kde.org/show_bug.cgi?id=494193
Submitted a fix at https://invent.kde.org/plasma/plasma-workspace/-/merge_requests/4797 waiting for it to be reviewed