message: Begin(): Removed unnecessary code (at the time of 1.18 commit CursorPos was used to compute SizeContentsFit and this was necessary)
diff: @@ -3984,7 +3984,6 @@ bool ImGui::Begin(const char* name, bool* p_open, const ImVec2& size_on_first_us
  bool window_pos_set_by_api = false, window_size_set_by_api = false;
  if (g.SetNextWindowPosCond)
  {
  - const ImVec2 backup_cursor_pos = window->DC.CursorPos; // FIXME: not sure of the exact reason of this saving/restore anymore :( need to look into that.
  if (window->Appearing)
  window->SetWindowPosAllowFlags |= ImGuiCond_Appearing;
  window_pos_set_by_api = (window->SetWindowPosAllowFlags & g.SetNextWindowPosCond) != 0;
  @@ -3997,7 +3996,6 @@ bool ImGui::Begin(const char* name, bool* p_open, const ImVec2& size_on_first_us
  {
  SetWindowPos(window, g.SetNextWindowPosVal, g.SetNextWindowPosCond);
  }
  - window->DC.CursorPos = backup_cursor_pos;
  g.SetNextWindowPosCond = 0;
  }
  if (g.SetNextWindowSizeCond)
  @@ -4042,7 +4040,6 @@ bool ImGui::Begin(const char* name, bool* p_open, const ImVec2& size_on_first_us
  window->RootWindow = g.CurrentWindowStack[root_idx];
  window->RootNonPopupWindow = g.CurrentWindowStack[root_non_popup_idx]; // Used to display TitleBgActive color and for selecting which window to use for NavWindowing
  -
  // When reusing window again multiple times a frame, just append content (don't need to setup again)
  if (first_begin_of_the_frame)
  {
  