perf: switch from String to SmartString

Cargo.lock

@@ -1532,6 +1532,7 @@ dependencies = [
  "serde",
  "serde_json",
  "slotmap",
+ "smartstring",
  "tempfile",
  "thiserror 2.0.9",
  "tokio",
@@ -2388,6 +2389,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3fb72c633efbaa2dd666986505016c32c3044395ceaf881518399d2f4127ee29"
 dependencies = [
  "autocfg",
+ "serde",
  "static_assertions",
  "version_check",
 ]

helix-view/Cargo.toml

@@ -52,6 +52,8 @@ log = "~0.4"
 parking_lot = "0.12.3"
 thiserror.workspace = true
 
+smartstring = { version = "1.0.1", features = ["serde"]}
+
 [target.'cfg(windows)'.dependencies]
 clipboard-win = { version = "5.4", features = ["std"] }
 

helix-view/src/editor/config.rs

@@ -2,6 +2,10 @@ use std::collections::HashMap;
 
 use serde::{Deserialize, Serialize};
 
+use smartstring::{LazyCompact, SmartString};
+
+type String = SmartString<LazyCompact>;
+
 #[derive(Debug, Serialize, Deserialize, Default, PartialEq, Eq, Clone)]
 #[serde(default)]
 pub struct Icons {