Fix emoting with emoji or pills (#8105)

* Fix emoting with emoji or pills

* Fix some slash command errors not being shown

* Re-enable mistakenly skipped SendMessageComposer tests

* Test emoting with non-text parts

src/SlashCommands.tsx

@@ -153,13 +153,11 @@ export class Command {
     public run(roomId: string, threadId: string, args: string): RunResult {
         // if it has no runFn then its an ignored/nop command (autocomplete only) e.g `/me`
         if (!this.runFn) {
-            reject(
+            return reject(
                 newTranslatableError(
                     "Command error: Unable to handle slash command.",
                 ),
             );
-
-            return;
         }
 
         const renderingType = threadId

src/editor/serialize.ts

@@ -181,7 +181,9 @@ export function textSerialize(model: EditorModel): string {
 }
 
 export function containsEmote(model: EditorModel): boolean {
-    return startsWith(model, "/me ", false) && model.parts[0]?.text?.length > 4;
+    const hasCommand = startsWith(model, "/me ", false);
+    const hasArgument = model.parts[0]?.text?.length > 4 || model.parts.length > 1;
+    return hasCommand && hasArgument;
 }
 
 export function startsWith(model: EditorModel, prefix: string, caseSensitive = true): boolean {

test/components/views/rooms/SendMessageComposer-test.tsx

@@ -131,6 +131,20 @@ describe('<SendMessageComposer/>', () => {
             });
         });
 
+        it("allows emoting with non-text parts", () => {
+            const model = new EditorModel([], createPartCreator(), createRenderer());
+            const documentOffset = new DocumentOffset(16, true);
+            model.update("/me ✨sparkles✨", "insertText", documentOffset);
+            expect(model.parts.length).toEqual(4); // Emoji count as non-text
+
+            const content = createMessageContent(model, null, undefined, permalinkCreator);
+
+            expect(content).toEqual({
+                body: "✨sparkles✨",
+                msgtype: "m.emote",
+            });
+        });
+
         it("allows sending double-slash escaped slash commands correctly", () => {
             const model = new EditorModel([], createPartCreator(), createRenderer());
             const documentOffset = new DocumentOffset(32, true);
@@ -194,7 +208,7 @@ describe('<SendMessageComposer/>', () => {
             });
         };
 
-        fit("renders text and placeholder correctly", () => {
+        it("renders text and placeholder correctly", () => {
             const wrapper = getComponent({ placeholder: "placeholder string" });
 
             expect(wrapper.find('[aria-label="placeholder string"]')).toHaveLength(1);