message: Fixed a one frame glitch, when window claiming focus themselves on appear, the title bar wouldn't use the focused color on that frame.
diff: @@ -4517,6 +4517,12 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
  if ((flags & ImGuiWindowFlags_Modal) != 0 && window == GetFrontMostModalRootWindow())
  window->DrawList->AddRectFilled(fullscreen_rect.Min, fullscreen_rect.Max, GetColorU32(ImGuiCol_ModalWindowDarkening, g.ModalWindowDarkeningRatio));
  + // Apply focus, new windows appears in front
  + bool want_focus = false;
  + if (window_just_activated_by_user && !(flags & ImGuiWindowFlags_NoFocusOnAppearing))
  + if (!(flags & (ImGuiWindowFlags_ChildWindow | ImGuiWindowFlags_Tooltip)) || (flags & ImGuiWindowFlags_Popup))
  + want_focus = true;
  +
  // Draw window + handle manual resize
  ImRect title_bar_rect = window->TitleBarRect();
  if (window->Collapsed)
  @@ -4571,7 +4577,7 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
  window->DrawList->AddRectFilled(window->Pos+ImVec2(0,window->TitleBarHeight()), window->Pos+window->Size, bg_col, window_rounding, (flags & ImGuiWindowFlags_NoTitleBar) ? ImDrawCornerFlags_All : ImDrawCornerFlags_Bot);
  // Title bar
  - const bool window_is_focused = g.NavWindow && window->RootNonPopupWindow == g.NavWindow->RootNonPopupWindow;
  + const bool window_is_focused = want_focus || (g.NavWindow && window->RootNonPopupWindow == g.NavWindow->RootNonPopupWindow);
  if (!(flags & ImGuiWindowFlags_NoTitleBar))
  window->DrawList->AddRectFilled(title_bar_rect.Min, title_bar_rect.Max, GetColorU32(window_is_focused ? ImGuiCol_TitleBgActive : ImGuiCol_TitleBg), window_rounding, ImDrawCornerFlags_Top);
  @@ -4658,9 +4664,8 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
  if (window->AutoFitFramesY > 0)
  window->AutoFitFramesY--;
  - // New windows appears in front (we need to do that AFTER setting DC.CursorStartPos so our initial navigation reference rectangle can start around there)
  - if (window_just_activated_by_user && !(flags & ImGuiWindowFlags_NoFocusOnAppearing))
  - if (!(flags & (ImGuiWindowFlags_ChildWindow|ImGuiWindowFlags_Tooltip)) || (flags & ImGuiWindowFlags_Popup))
  + // Apply focus (we need to call FocusWindow() AFTER setting DC.CursorStartPos so our initial navigation reference rectangle can start around there)
  + if (want_focus)
  FocusWindow(window);
  // Title bar
  