feat: remove extra dependency

Cargo.lock

@@ -1469,7 +1469,6 @@ dependencies = [
  "futures-util",
  "grep-regex",
  "grep-searcher",
- "heck",
  "helix-core",
  "helix-dap",
  "helix-event",

helix-term/Cargo.toml

@@ -53,7 +53,6 @@ helix-loader = { path = "../helix-loader" }
 anyhow = "1"
 once_cell = "1.20"
 
-heck = "0.5"
 tokio = { version = "1", features = ["rt", "rt-multi-thread", "io-util", "io-std", "time", "process", "macros", "fs", "parking_lot"] }
 tui = { path = "../helix-tui", package = "helix-tui", default-features = false, features = ["crossterm"] }
 crossterm = { version = "0.28", features = ["event-stream"] }

helix-term/src/commands.rs

@@ -1717,12 +1717,13 @@ fn replace(cx: &mut Context) {
 
 fn switch_case_impl<F>(cx: &mut Context, change_fn: F)
 where
-    F: Fn(RopeSlice) -> Tendril,
+    F: Fn(&dyn Iterator<Item = char>) -> Tendril,
 {
     let (view, doc) = current!(cx.editor);
     let selection = doc.selection(view.id);
     let transaction = Transaction::change_by_selection(doc.text(), selection, |range| {
-        let text: Tendril = change_fn(range.slice(doc.text().slice(..)));
+        let chars = range.slice(doc.text().slice(..)).chars();
+        let text = change_fn(&chars);
 
         (range.from(), range.to(), Some(text))
     });