Fix some international keybindings

This adds primitive interaction with the IME system for keyboard
shortcuts in zed.

For zed-industries/community#1981
For zed-industroes/community#1913

crates/gpui/src/platform/mac/window.rs

@@ -988,7 +988,32 @@ extern "C" fn handle_key_event(this: &Object, native_event: id, key_equivalent:
                         .flatten()
                         .is_some();
                 if !is_composing {
-                    handled = callback(Event::KeyDown(event));
+                    // if the IME has changed the key, we'll first emit an event with the character
+                    // generated by the IME system; then fallback to the keystroke if that is not
+                    // handled.
+                    // (e.g. on a brazillian keyboard to type a quote you type quote then space)
+                    // (e.g. on a czech keyboard typing a $ requires option+shift+4)
+                    if ime_text.is_some() && ime_text.as_ref() != Some(&event.keystroke.key) {
+                        let event_with_ime_text = KeyDownEvent {
+                            is_held: false,
+                            keystroke: Keystroke {
+                                ctrl: false,
+                                alt: false,
+                                shift: false,
+                                cmd: false,
+                                function: false,
+                                key: ime_text.clone().unwrap(),
+                            },
+                        };
+                        handled = callback(Event::KeyDown(event_with_ime_text));
+                    }
+                    if !handled {
+                        // empty key happens when you type a deadkey in input composition.
+                        // (e.g. on a brazillian keyboard typing quote is a deadkey)
+                        if !event.keystroke.key.is_empty() {
+                            handled = callback(Event::KeyDown(event));
+                        }
+                    }
                 }
 
                 if !handled {