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Minimal test - lines (22, 101)

Code

namespace mozilla {
namespace widget {

#ifndef __MINGW32__
static ComPtr GetInputPane(HWND aHwnd) {
  ComPtr inputPaneInterop;
  HRESULT hr = RoGetActivationFactory(
      HStringReference(RuntimeClass_Windows_UI_ViewManagement_InputPane).Get(),
      IID_PPV_ARGS(&inputPaneInterop));
  if (NS_WARN_IF(FAILED(hr))) {
    return nullptr;
  }

  ComPtr inputPane;
  hr = inputPaneInterop->GetForWindow(aHwnd, IID_PPV_ARGS(&inputPane));
  if (NS_WARN_IF(FAILED(hr))) {
    return nullptr;
  }

  ComPtr inputPane2;
  inputPane.As(&inputPane2);
  return inputPane2;
}

#  ifdef DEBUG
static bool IsInputPaneVisible(ComPtr& aInputPane2) {
  ComPtr inputPaneControl;
  aInputPane2.As(&inputPaneControl);
  if (NS_WARN_IF(!inputPaneControl)) {
    return false;
  }
  boolean visible = false;
  inputPaneControl->get_Visible(&visible);
  return visible;
}

static bool IsForegroundApp() {
  HWND foregroundWnd = ::GetForegroundWindow();
  if (!foregroundWnd) {
    return false;
  }
  DWORD pid;
  ::GetWindowThreadProcessId(foregroundWnd, &pid);
  return pid == ::GetCurrentProcessId();
}
#  endif
#endif

// static
void OSKInputPaneManager::ShowOnScreenKeyboard(HWND aWnd) {
#ifndef __MINGW32__
  ComPtr inputPane2 = GetInputPane(aWnd);
  if (!inputPane2) {
    return;
  }
  boolean result;
  inputPane2->TryShow(&result);
  NS_WARNING_ASSERTION(
      result || !IsForegroundApp() || IsInputPaneVisible(inputPane2),
      "IInputPane2::TryShow is failure");
#endif
}

// static
void OSKInputPaneManager::DismissOnScreenKeyboard(HWND aWnd) {
#ifndef __MINGW32__
  ComPtr inputPane2 = GetInputPane(aWnd);
  if (!inputPane2) {
    return;
  }
  boolean result;
  inputPane2->TryHide(&result);
  NS_WARNING_ASSERTION(
      result || !IsForegroundApp() || !IsInputPaneVisible(inputPane2),
      "IInputPane2::TryHide is failure");
#endif
}

}  // namespace widget
}  // namespace mozilla