message: Begin: Remove unnecessary usage of window_is_new flag, as both fields are zero on window creation.
diff: @@ -4272,13 +4272,11 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
  flags |= ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoResize;
  // Find or create
  - bool window_is_new = false;
  ImGuiWindow* window = FindWindowByName(name);
  if (!window)
  {
  ImVec2 size_on_first_use = (g.SetNextWindowSizeCond != 0) ? g.SetNextWindowSizeVal : ImVec2(0.0f, 0.0f); // Any condition flag will do since we are creating a new window here.
  window = CreateNewWindow(name, size_on_first_use, flags);
  - window_is_new = true;
  }
  const int current_frame = g.FrameCount;
  @@ -4422,8 +4420,8 @@ bool ImGui::Begin(const char* name, bool* p_open, ImGuiWindowFlags flags)
  // SIZE
  // Update contents size from last frame for auto-fitting (unless explicitly specified)
  - window->SizeContents.x = (float)(int)((window->SizeContentsExplicit.x != 0.0f) ? window->SizeContentsExplicit.x : ((window_is_new ? 0.0f : window->DC.CursorMaxPos.x - window->Pos.x) + window->Scroll.x));
  - window->SizeContents.y = (float)(int)((window->SizeContentsExplicit.y != 0.0f) ? window->SizeContentsExplicit.y : ((window_is_new ? 0.0f : window->DC.CursorMaxPos.y - window->Pos.y) + window->Scroll.y));
  + window->SizeContents.x = (float)(int)((window->SizeContentsExplicit.x != 0.0f) ? window->SizeContentsExplicit.x : (window->DC.CursorMaxPos.x - window->Pos.x + window->Scroll.x));
  + window->SizeContents.y = (float)(int)((window->SizeContentsExplicit.y != 0.0f) ? window->SizeContentsExplicit.y : (window->DC.CursorMaxPos.y - window->Pos.y + window->Scroll.y));
  window->SizeContents += window->WindowPadding;
  // Hide popup/tooltip window when re-opening while we measure size (because we recycle the windows)
  