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Hi! I'm using egui for the UI of a VST3/Clap plugin, and this kind of environment is rather picky on performance. I use [assert_no_alloc](https://crates.io/crates/assert_no_alloc) to make sure the audio thread is never allocating. The audio thread may request a repaint of the GUI tho, and this is where a saw that it may allocate when tracing the repaint reason. Turns out it's not necessary, `Location::caller` is `'static`, so using a `&'static str` instead of a `String` in `RepaintCause::file` will just work, so this PR just does that.