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Closes <https://github.com/emilk/egui/issues/3474>.
* Allow widget focus change with keyboard arrows
* remove set id function
* docs
* Emilk feedback round 1
* Fix compile error
* undo example
* Move out functions from range to memory.rs
* remove contains range
* Use docstrings
* code cleanup
* Improve candidate logic
* More tweaks
* Less `pub`
---------
Co-authored-by: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>
