renderer: add canSkipBackBufferClear

src/render/Renderer.hpp

@@ -52,6 +52,7 @@ class CHyprRenderer {
     std::tuple<float, float, float> getRenderTimes(CMonitor* pMonitor); // avg max min
     void                            renderLockscreen(CMonitor* pMonitor, timespec* now);
     void                            setOccludedForBackLayers(CRegion& region, CWorkspace* pWorkspace);
+    bool                            canSkipBackBufferClear(CMonitor* pMonitor);
 
     bool                            m_bWindowRequestedCursorHide = false;
     bool                            m_bBlockSurfaceFeedback      = false;