In response to user input I am creating a window that has an InputText. I would like the text to automatically starts out as selected when the window pops up, so I want to call SetKeyboardFocusHere, but only if the window has not been visible (active(?)) before.

This hack seems to do the trick:

bool ImGui::WindowWasActive(const char* name) {
  ImGuiWindow* window = FindWindowByName(name);
  return window != 0 && (window->WasActive || window->Active);
}

Is there an official way of doing this? Adding an optional bool* parameter to Begin might be cleaner.