[kwin] [Bug 475325] KDE 6 wayland fractional scale blurry when result of division W/scale or H/scale is not an integer

[bugzilla_noreply]

https://bugs.kde.org/show_bug.cgi?id=475325

--- Comment #8 from zvova7...@gmail.com ---
Huang-Huang Bao,

I think your patch makes sense. Please create a MR:
https://invent.kde.org/plasma/kwin

It seems it was typo when they refactor this(and this is why kwin5 branch is
fine):

void WorkspaceScene::prePaint(SceneDelegate *delegate)
{
    createStackingOrder();

    m_paintedDelegate = delegate;
    if (kwinApp()->operationMode() == Application::OperationModeX11) {
        painted_screen = workspace()->outputs().constFirst();
        m_renderer->setRenderTargetRect(geometry());
        m_renderer->setRenderTargetScale(1);
    } else {
        painted_screen = m_paintedDelegate->output();
        m_renderer->setRenderTargetRect(painted_screen->fractionalGeometry());
        m_renderer->setRenderTargetScale(painted_screen->scale());
    }

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