layersurface: round geom in arrangeLayerArray

fixes #8171

src/render/Renderer.cpp

@@ -1742,7 +1742,9 @@ void CHyprRenderer::arrangeLayerArray(PHLMONITOR pMonitor, const std::vector<PHL
             Debug::log(ERR, "LayerSurface {:x} has a negative/zero w/h???", (uintptr_t)ls.get());
             continue;
         }
-        // Apply
+
+        box.round(); // fix rounding errors
+
         ls->geometry = box;
 
         applyExclusive(*usableArea, PSTATE->anchor, PSTATE->exclusive, PSTATE->exclusiveEdge, PSTATE->margin.top, PSTATE->margin.right, PSTATE->margin.bottom, PSTATE->margin.left);