Function widgetOverFlatbuttonInvalidate

src/OpenLoco/src/Input/MouseInput.cpp:1497–1522

#pragma mark - Widgets

    static void widgetOverFlatbuttonInvalidate()
    {
        Ui::WindowType windowType = _hoverWindowType;
        Ui::WidgetIndex_t widgetIdx = _hoverWidgetIdx;
        Ui::WindowNumber_t windowNumber = _hoverWindowNumber;

        if (windowType == Ui::WindowType::undefined)
        {
            WindowManager::invalidateWidget(windowType, windowNumber, widgetIdx);
            return;
        }

        Ui::Window* oldWindow = WindowManager::find(windowType, windowNumber);

        if (oldWindow != nullptr)
        {
            oldWindow->callPrepareDraw();

            Ui::Widget* oldWidget = widgetIdx != kWidgetIndexNull ? &oldWindow->widgets[widgetIdx] : nullptr;
            if (oldWidget != nullptr
                && (oldWidget->type == Ui::WidgetType::buttonWithColour || oldWidget->type == Ui::WidgetType::buttonWithImage))
            {
                WindowManager::invalidateWidget(windowType, windowNumber, widgetIdx);
            }
        }
    }

#pragma mark -