Method ErrorCheckEndFrameSanityChecks

src/third-party/imgui/imgui.cpp:7961–7995

}

static void ImGui::ErrorCheckEndFrameSanityChecks()
{
    ImGuiContext& g = *GImGui;

    // Verify that io.KeyXXX fields haven't been tampered with. Key mods should not be modified between NewFrame() and EndFrame()
    // One possible reason leading to this assert is that your backends update inputs _AFTER_ NewFrame().
    // It is known that when some modal native windows called mid-frame takes focus away, some backends such as GLFW will
    // send key release events mid-frame. This would normally trigger this assertion and lead to sheared inputs.
    // We silently accommodate for this case by ignoring/ the case where all io.KeyXXX modifiers were released (aka key_mod_flags == 0),
    // while still correctly asserting on mid-frame key press events.
    const ImGuiKeyModFlags key_mod_flags = GetMergedKeyModFlags();
    IM_ASSERT((key_mod_flags == 0 || g.IO.KeyMods == key_mod_flags) && "Mismatching io.KeyCtrl/io.KeyShift/io.KeyAlt/io.KeySuper vs io.KeyMods");
    IM_UNUSED(key_mod_flags);

    // Recover from errors
    //ErrorCheckEndFrameRecover();

    // Report when there is a mismatch of Begin/BeginChild vs End/EndChild calls. Important: Remember that the Begin/BeginChild API requires you
    // to always call End/EndChild even if Begin/BeginChild returns false! (this is unfortunately inconsistent with most other Begin* API).
    if (g.CurrentWindowStack.Size != 1)
    {
        if (g.CurrentWindowStack.Size > 1)
        {
            IM_ASSERT_USER_ERROR(g.CurrentWindowStack.Size == 1, "Mismatched Begin/BeginChild vs End/EndChild calls: did you forget to call End/EndChild?");
            while (g.CurrentWindowStack.Size > 1)
                End();
        }
        else
        {
            IM_ASSERT_USER_ERROR(g.CurrentWindowStack.Size == 1, "Mismatched Begin/BeginChild vs End/EndChild calls: did you call End/EndChild too much?");
        }
    }

    IM_ASSERT_USER_ERROR(g.GroupStack.Size == 0, "Missing EndGroup call!");
}

// Experimental recovery from incorrect usage of BeginXXX/EndXXX/PushXXX/PopXXX calls.
// Must be called during or before EndFrame().