Fix invite dialog showing the same user multiple times

src/components/views/dialogs/InviteDialog.tsx

@@ -21,6 +21,7 @@ import { Room } from "matrix-js-sdk/src/models/room";
 import { MatrixCall } from "matrix-js-sdk/src/webrtc/call";
 import { logger } from "matrix-js-sdk/src/logger";
 import { MatrixError } from "matrix-js-sdk/src/matrix";
+import { uniqBy } from "lodash";
 
 import { Icon as InfoIcon } from "../../../../res/img/element-icons/info.svg";
 import { Icon as EmailPillAvatarIcon } from "../../../../res/img/icon-email-pill-avatar.svg";
@@ -384,6 +385,7 @@ export default class InviteDialog extends React.PureComponent<Props, IInviteDial
         this.state = {
             targets: [], // array of Member objects (see interface above)
             filterText: this.props.initialText || "",
+            // Mutates alreadyInvited set so that buildSuggestions doesn't duplicate any users
             recents: InviteDialog.buildRecents(alreadyInvited),
             numRecentsShown: INITIAL_ROOMS_SHOWN,
             suggestions: this.buildSuggestions(alreadyInvited),
@@ -476,6 +478,8 @@ export default class InviteDialog extends React.PureComponent<Props, IInviteDial
             }
 
             recents.push({ userId, user: toMember(roomMember), lastActive: lastEventTs });
+            // We mutate the given set so that any later callers avoid duplicating these users
+            excludedTargetIds.add(userId);
         }
         if (!recents) logger.warn("[Invite:Recents] No recents to suggest!");
 
@@ -821,7 +825,7 @@ export default class InviteDialog extends React.PureComponent<Props, IInviteDial
         if (!this.state.busy) {
             let filterText = this.state.filterText;
             let targets = this.state.targets.map((t) => t); // cheap clone for mutation
-            const idx = targets.indexOf(member);
+            const idx = targets.findIndex((m) => m.userId === member.userId);
             if (idx >= 0) {
                 targets.splice(idx, 1);
             } else {
@@ -945,11 +949,11 @@ export default class InviteDialog extends React.PureComponent<Props, IInviteDial
         if (unableToAddMore) {
             this.setState({
                 filterText: unableToAddMore.join(" "),
-                targets: [...this.state.targets, ...toAdd],
+                targets: uniqBy([...this.state.targets, ...toAdd], (t) => t.userId),
             });
         } else {
             this.setState({
-                targets: [...this.state.targets, ...toAdd],
+                targets: uniqBy([...this.state.targets, ...toAdd], (t) => t.userId),
             });
         }
     };
@@ -1001,6 +1005,7 @@ export default class InviteDialog extends React.PureComponent<Props, IInviteDial
             // The type of u is a pain to define but members of both mixins have the 'userId' property
             const notAlreadyExists = (u: any): boolean => {
                 return (
+                    !this.state.recents.some((m) => m.userId === u.userId) &&
                     !sourceMembers.some((m) => m.userId === u.userId) &&
                     !priorityAdditionalMembers.some((m) => m.userId === u.userId) &&
                     !otherAdditionalMembers.some((m) => m.userId === u.userId)

test/components/views/dialogs/InviteDialog-test.tsx

@@ -15,7 +15,7 @@ limitations under the License.
 */
 
 import React from "react";
-import { render, screen } from "@testing-library/react";
+import { fireEvent, render, screen } from "@testing-library/react";
 import userEvent from "@testing-library/user-event";
 import { RoomType } from "matrix-js-sdk/src/@types/event";
 import { MatrixClient, MatrixError, Room } from "matrix-js-sdk/src/matrix";
@@ -366,6 +366,35 @@ describe("InviteDialog", () => {
         ]);
     });
 
+    it("should not allow pasting the same user multiple times", async () => {
+        render(<InviteDialog kind={InviteKind.Invite} roomId={roomId} onFinished={jest.fn()} />);
+
+        const input = screen.getByTestId("invite-dialog-input");
+        input.focus();
+        await userEvent.paste(`${bobId}`);
+        await userEvent.paste(`${bobId}`);
+        await userEvent.paste(`${bobId}`);
+
+        expect(input).toHaveValue("");
+        await expect(screen.findAllByText(bobId, { selector: "a" })).resolves.toHaveLength(1);
+    });
+
+    it("should add to selection on click of user tile", async () => {
+        render(<InviteDialog kind={InviteKind.Invite} roomId={roomId} onFinished={jest.fn()} />);
+
+        const input = screen.getByTestId("invite-dialog-input");
+        input.focus();
+        await userEvent.keyboard(`${aliceId}`);
+
+        const btn = await screen.findByText(aliceId, {
+            selector: ".mx_InviteDialog_tile_nameStack_userId .mx_InviteDialog_tile--room_highlight",
+        });
+        fireEvent.click(btn);
+
+        const tile = await screen.findByText(aliceId, { selector: ".mx_InviteDialog_userTile_name" });
+        expect(tile).toBeInTheDocument();
+    });
+
     describe("when inviting a user with an unknown profile", () => {
         beforeEach(async () => {
             render(<InviteDialog kind={InviteKind.Dm} onFinished={jest.fn()} />);