<!--
Please read the "Making a PR" section of
[`CONTRIBUTING.md`](https://github.com/emilk/egui/blob/master/CONTRIBUTING.md)
before opening a Pull Request!
* Keep your PR:s small and focused.
* If applicable, add a screenshot or gif.
* If it is a non-trivial addition, consider adding a demo for it to
`egui_demo_lib`, or a new example.
* Do NOT open PR:s from your `master` branch, as that makes it hard for
maintainers to add commits to your PR.
* Remember to run `cargo fmt` and `cargo cranky`.
* Open the PR as a draft until you have self-reviewed it and run
`./scripts/check.sh`.
* When you have addressed a PR comment, mark it as resolved.
Please be patient! I will review your PR, but my time is limited!
-->
Closes <https://github.com/emilk/egui/issues/3474>.
* Using tracing-subscriber in hello_world example
* Add Key::Plus/Minus/Equals
* Warn if failing to guess OS from User-Agent
* Remove jitter when using Context::set_pixels_per_point
* Demo app: zoom in/out using ⌘+ and ⌘-
* Demo app: make backend panel GUI scale slider better
* Optimize debug builds a bit
* typo
* Update changelog
* Add helper module `egui::gui_zoom` for zooming an app
* Better names, and update changelog
* Combine Plus and Equals keys
* Last fix
* Fix docs
Fredrik Fornwall
YgorSouza
Emil Ernerfeldt
lucasmerlin