T13: a label built from a path shows control characters as their pictures, so a name with a newline no longer aborts gpui's line shaping in Files or the session row; on macOS a name meets Git's mark in composed form, as git writes it; the rev-parse prefix keeps its own newlines

Cargo.toml

@@ -32,6 +32,7 @@ signal-hook = "0.4"
 [target.'cfg(target_os = "macos")'.dependencies]
 block = "0.1"
 objc = "0.2"
+unicode-normalization = "0.1"
 
 [target.'cfg(target_os = "macos")'.dev-dependencies]
 core-graphics = { version = "0.24", features = ["highsierra"] }