* Closes https://github.com/emilk/egui/issues/5423
New output is actionable
```
failures:
---- demo::demo_app_windows::tests::demos_should_match_snapshot stdout ----
thread 'demo::demo_app_windows::tests::demos_should_match_snapshot' panicked at crates/egui_demo_lib/src/demo/demo_app_windows.rs:433:9:
Errors: [
"'demos/Code Example' Image size did not match snapshot. Expected: (402, 574), Actual: (415, 574).
Run `UPDATE_SNAPSHOTS=1 cargo test` to update the snapshots.",
]
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
failures:
demo::demo_app_windows::tests::demos_should_match_snapshot
```
Please take a look @Bromeon and @EmbersArc!
You have both contributed substantially to `egui_plot` (more than I
have).
This is me inviting you to co-maintain the `egui_plot` crate.
If you accept, you'll get a notification when someone opens a PR
touching `egui_plot`, and you can review and merge it as you see fit.
You can also merge your own egui_plot PRs without waiting on me to
review them.
Emil Ernerfeldt