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<!-- 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. * The PR title is what ends up in the changelog, so make it descriptive! * 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 clippy`. * 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! --> All the other crates in egui have serde as an optional dependency - which is great! But sadly egui_extras unconditionally includes it, which adds a bunch of code to stuff that may not care for it. This PR gates serde support behind a new `serde` feature. This is a breaking change; if that's undesirable then we can add it as a default feature instead, though that wouldn't match any of the other crates.
Test apps
Some application to tests various parts of egui and eframe.
At some point it would be nice to have automatic screenshot regression tests for these.