This also has been one of my biggest gripes with "imgui" style of libraries - as the end of the day something needs to keep state somewhere, and implementations/hack can be very language/runtime oriented to avoid hacks like above, or use the hack above.
It also caught me by surprise, and would catch many others where seemingly normal controls, that just happen to have the same text would be identified with the same state, as the text (contents) are initially used to point to this state.
It also caught me by surprise, and would catch many others where seemingly normal controls, that just happen to have the same text would be identified with the same state, as the text (contents) are initially used to point to this state.