Allowing DeltaTime==0.0f to not assert

imgui.cpp

@@ -2080,10 +2080,10 @@ void ImGui::NewFrame()
     ImGuiState& g = *GImGui;
 
     // Check user data
-    IM_ASSERT(g.IO.DeltaTime > 0.0f);
+    IM_ASSERT(g.IO.DeltaTime >= 0.0f);
     IM_ASSERT(g.IO.DisplaySize.x >= 0.0f && g.IO.DisplaySize.y >= 0.0f);
     IM_ASSERT(g.IO.RenderDrawListsFn != NULL);       // Must be implemented
-    IM_ASSERT(g.IO.Fonts->Fonts.Size > 0);         // Font Atlas not created. Did you call io.Fonts->GetTexDataAsRGBA32 / GetTexDataAsAlpha8 ?
+    IM_ASSERT(g.IO.Fonts->Fonts.Size > 0);           // Font Atlas not created. Did you call io.Fonts->GetTexDataAsRGBA32 / GetTexDataAsAlpha8 ?
     IM_ASSERT(g.IO.Fonts->Fonts[0]->IsLoaded());     // Font Atlas not created. Did you call io.Fonts->GetTexDataAsRGBA32 / GetTexDataAsAlpha8 ?
 
     if (!g.Initialized)