[plasmashell] [Bug 520190] Plasmashell GEM / DMABuf export leak

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=520190

--- Comment #13 from rick...@refused.net ---
Just posting the full code snippet for clarity.
In  plasma-desktop/applets/taskmanager/qml/ToolTipInstance.qml

        Loader {
            id: pipeWireLoader
            anchors.fill: hoverHandler
            // Indent a little bit so that neither the thumbnail nor the drop
            // shadow can cover up the highlight
            anchors.margins: thumbnailLoader.anchors.margins

            active: Plasmoid.configuration.showToolTips
                && !toolTipDelegate.isLauncher
                && !albumArtImage.visible
                && KWindowSystem.isPlatformWayland
                && root.index !== -1
                && Window.visibility !== Window.Hidden // hack 1

            asynchronous: true
            //In a loader since we might not have PipeWire available yet
(WITH_PIPEWIRE could be undefined in
plasma-workspace/libtaskmanager/<declarative/taskmanagerplugin.cpp)
            source: "PipeWireThumbnail.qml"

            // hack 2
            onActiveChanged: {
                if (!active && item) {
                    item.visible = false
                }
            }
        }

This code works for me but if I try to solve the flicker issue that this comes
with it, it starts to leak again.
Note: With the above code, it always seem to hold the last thumbnail preview in
memory until you hover over something that doesn't have a thumbnail, so you
might see a temporary "leak" but it should clear.

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