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Currently egui will prevent all web events from propagating. This causes issues in contexts where you are using egui in a larger web context that wants to receive events that egui does not directly respond to. For example, currently using egui in a VSCode extension will block all app hotkeys, such as saving and opening the panel. This adds a closure to `WebOptions` that takes in a reference to the egui event that is generated from a web event and returns if the corresponding web event should be propagated or not. The default for it is to always return false. Alternatives I considered were: 1. Having the propagation filter be a property of the focus in memory. That way it could be configured by the view currently selected. I opted away from that because I wanted to avoid lowering eframe implementation specific stuff into egui. 2. Having events contain a `web_propagate` flag that could be set when handling them. However, that would not be compatible with the current system of egui events being handled outside of the web event handler. I just recently started using egui so I am not sure how idiomatic my approach here is. I would be happy to switch this over to a different architecture if there are suggestions. <!-- 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 test and 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! --> * [x] I have followed the instructions in the PR template