Re-entrant SendKeystrokes (#20277)

Release Notes:

- Improved `workspace::SendKeystrokes` to support re-binding keys. For
example you can now do: `"x": ["workspace::SendKeystrokes", "\" _ x"]`
in vim mode to ensure that `x` does not clobber your clipboard.
- Improved key binding documentation

crates/vim/src/test.rs

@@ -1403,6 +1403,32 @@ async fn test_remap_nested_pineapple(cx: &mut gpui::TestAppContext) {
     cx.shared_state().await.assert_eq("🍍ˇ");
 }
 
+#[gpui::test]
+async fn test_remap_recursion(cx: &mut gpui::TestAppContext) {
+    let mut cx = NeovimBackedTestContext::new(cx).await;
+    cx.update(|cx| {
+        cx.bind_keys([KeyBinding::new(
+            "x",
+            workspace::SendKeystrokes("\" _ x".to_string()),
+            Some("VimControl"),
+        )]);
+        cx.bind_keys([KeyBinding::new(
+            "y",
+            workspace::SendKeystrokes("2 x".to_string()),
+            Some("VimControl"),
+        )])
+    });
+    cx.neovim.exec("noremap x \"_x").await;
+    cx.neovim.exec("map y 2x").await;
+
+    cx.set_shared_state("ˇhello").await;
+    cx.simulate_shared_keystrokes("d l").await;
+    cx.shared_clipboard().await.assert_eq("h");
+    cx.simulate_shared_keystrokes("y").await;
+    cx.shared_clipboard().await.assert_eq("h");
+    cx.shared_state().await.assert_eq("ˇlo");
+}
+
 #[gpui::test]
 async fn test_escape_while_waiting(cx: &mut gpui::TestAppContext) {
     let mut cx = NeovimBackedTestContext::new(cx).await;

crates/vim/test_data/test_remap_recursion.json

@@ -0,0 +1,11 @@
+{"Exec":{"command":"noremap x \"_x"}}
+{"Exec":{"command":"map y 2x"}}
+{"Put":{"state":"ˇhello"}}
+{"Key":"d"}
+{"Key":"l"}
+{"Get":{"state":"ˇello","mode":"Normal"}}
+{"ReadRegister":{"name":"\"","value":"h"}}
+{"Key":"y"}
+{"Get":{"state":"ˇlo","mode":"Normal"}}
+{"ReadRegister":{"name":"\"","value":"h"}}
+{"Get":{"state":"ˇlo","mode":"Normal"}}