Metrics: Fixed "Drawlists" section and per-viewport equivalent appearing empty (regression from c649aca).

(#6597, #6475, #6167, #5776, #5109, #4763, #3515, #1860)

docs/CHANGELOG.txt

@@ -48,6 +48,8 @@ Other changes:
   v_max=INT_MAX (#6675, #6679) [@jbarthelmes]
 - ImDrawList: Fixed OOB access in _CalcCircleAutoSegmentCount when passing excessively
   large radius to AddCircle(). (#6657, #5317) [@EggsyCRO, @jdpatdiscord]
+- Debug Tools: Metrics: Fixed "Drawlists" section and per-viewport equivalent
+  appearing empty (regression in 1.89.8).
 - Demo: Demonstrate out-of-order rendering using ImDrawListSplitter.
 
 

imgui.cpp

@@ -4566,10 +4566,7 @@ void ImGui::NewFrame()
 
     // Mark rendering data as invalid to prevent user who may have a handle on it to use it.
     for (int n = 0; n < g.Viewports.Size; n++)
-    {
-        ImGuiViewportP* viewport = g.Viewports[n];
-        viewport->DrawDataP.Clear();
-    }
+        g.Viewports[n]->DrawDataP.Valid = false;
 
     // Drag and drop keep the source ID alive so even if the source disappear our state is consistent
     if (g.DragDropActive && g.DragDropPayload.SourceId == g.ActiveId)