fix(Emoji): allow Enter to create new line when no emoji is selected

src/extensions/yfm/Emoji/EmojiSuggest/EmojiHandler.test.ts

@@ -0,0 +1,48 @@
+import type {AutocompleteAction} from '../../../behavior/Autocomplete';
+
+import {EmojiHandler} from './EmojiHandler';
+
+describe('EmojiHandler', () => {
+    describe('onEnter', () => {
+        it('should return false when no emoji is selected', () => {
+            const handler = new EmojiHandler({
+                defs: {smile: '😀'},
+            });
+
+            const action = {
+                view: {},
+            } as AutocompleteAction;
+
+            // onEnter called without onOpen/onFilter - no emoji carousel initialized
+            const result = handler.onEnter(action);
+
+            expect(result).toBe(false);
+        });
+
+        it('should return true when emoji is selected', () => {
+            const handler = new EmojiHandler({
+                defs: {smile: '😀'},
+            });
+
+            // Access private _emojiCarousel to simulate selected emoji
+            // @ts-expect-error - accessing private property for testing
+            handler._emojiCarousel = {
+                currentItem: {symbol: '😀', origName: 'smile', name: 'smile'},
+            };
+
+            const mockDispatch = jest.fn();
+            const action = {
+                view: {
+                    state: {
+                        selection: {empty: true},
+                    },
+                    dispatch: mockDispatch,
+                },
+            } as unknown as AutocompleteAction;
+
+            const result = handler.onEnter(action);
+
+            expect(result).toBe(true);
+        });
+    });
+});

src/extensions/yfm/Emoji/EmojiSuggest/EmojiHandler.ts

@@ -108,8 +108,12 @@ export class EmojiHandler implements AutocompleteHandler {
     onEnter(action: AutocompleteAction): boolean {
         this.updateState(action);
 
-        this.select();
+        const emojiDef = this._emojiCarousel?.currentItem;
+        if (!emojiDef) {
+            return false;
+        }
 
+        this.select();
         return true;
     }
 
@@ -243,7 +247,7 @@ function filterEmojis(defs: readonly EmojiDef[], text: string): readonly EmojiDe
     return byShortcuts.concat(byName);
 }
 
-const CHARS_TO_HIDE = 4;
+const CHARS_TO_HIDE = 1;
 function needToHide(defs: readonly EmojiDef[], text: string): boolean {
     let iter = 1;
     do {