[MM-60555] Use channel memberships to calculate total unread status instead of team memberships (#30166)

* [MM-60555] Use channel memberships to calculate total unread status instead of team memberships

* Fix lint

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

webapp/channels/src/packages/mattermost-redux/src/selectors/entities/channels.test.ts

@@ -2189,7 +2189,7 @@ describe('Selectors.Channels.getUnreadStatus', () => {
     });
 
     it('get unreads', () => {
-        expect(Selectors.getUnreadStatus(testState)).toBe(69);
+        expect(Selectors.getUnreadStatus(testState)).toBe(5);
     });
 
     it('get unreads with a missing profile entity', () => {
@@ -2208,7 +2208,7 @@ describe('Selectors.Channels.getUnreadStatus', () => {
             },
         };
 
-        expect(Selectors.getUnreadStatus(newState)).toBe(69);
+        expect(Selectors.getUnreadStatus(newState)).toBe(5);
     });
 
     it('get unreads with a deactivated user', () => {
@@ -2230,7 +2230,7 @@ describe('Selectors.Channels.getUnreadStatus', () => {
                 },
             },
         };
-        expect(Selectors.getUnreadStatus(newState)).toBe(69);
+        expect(Selectors.getUnreadStatus(newState)).toBe(5);
     });
 
     it('get unreads with a deactivated channel', () => {
@@ -2253,17 +2253,15 @@ describe('Selectors.Channels.getUnreadStatus', () => {
             },
         };
 
-        expect(Selectors.getUnreadStatus(newState)).toBe(65);
+        expect(Selectors.getUnreadStatus(newState)).toBe(1);
     });
 });
 
 describe('Selectors.Channels.getUnreadStatus', () => {
     const team1 = {id: 'team1', delete_at: 0};
-    const team2 = {id: 'team2', delete_at: 0};
 
     const channelA = {id: 'channelA', name: 'channelA', team_id: 'team1', delete_at: 0};
     const channelB = {id: 'channelB', name: 'channelB', team_id: 'team1', delete_at: 0};
-    const channelC = {id: 'channelB', name: 'channelB', team_id: 'team2', delete_at: 0};
 
     const dmChannel = {id: 'dmChannel', name: 'user1__user2', team_id: '', delete_at: 0, type: General.DM_CHANNEL};
     const gmChannel = {id: 'gmChannel', name: 'gmChannel', team_id: 'team1', delete_at: 0, type: General.GM_CHANNEL};
@@ -2497,61 +2495,6 @@ describe('Selectors.Channels.getUnreadStatus', () => {
         expect(unreadMeta.isUnread).toBe(true); // gmChannel is unread
         expect(unreadMeta.unreadMentionCount).toBe(gmMember.mention_count);
     });
-
-    test('should count mentions and messages for other teams from team members', () => {
-        const myMemberA = {mention_count: 2, msg_count: 3, notify_props: {mark_unread: 'all'}};
-        const myMemberC = {mention_count: 5, msg_count: 7, notify_props: {mark_unread: 'all'}};
-
-        const teamMember1 = {msg_count: 1, mention_count: 2};
-        const teamMember2 = {msg_count: 3, mention_count: 6};
-
-        const state = {
-            entities: {
-                general: {config: {}},
-                preferences: {
-                    myPreferences: {},
-                },
-                threads: {
-                    counts: {},
-                },
-                channels: {
-                    channels: {
-                        channelA,
-                        channelC,
-                    },
-                    messageCounts: {
-                        channelA: {total: 11},
-                        channelC: {total: 17},
-                    },
-                    myMembers: {
-                        channelA: myMemberA,
-                        channelC: myMemberC,
-                    },
-                },
-                teams: {
-                    currentTeamId: 'team1',
-                    myMembers: {
-                        team1: teamMember1,
-                        team2: teamMember2,
-                    },
-                    teams: {
-                        team1,
-                        team2,
-                    },
-                },
-                users: {
-                    currentUserId: 'user1',
-                    profiles: {},
-                },
-            },
-        } as unknown as GlobalState;
-
-        const unreadStatus = Selectors.getUnreadStatus(state);
-        const unreadMeta = Selectors.basicUnreadMeta(unreadStatus);
-
-        expect(unreadMeta.isUnread).toBe(true); // channelA and channelC are unread
-        expect(unreadMeta.unreadMentionCount).toBe(myMemberA.mention_count + teamMember2.mention_count);
-    });
 });
 
 describe('Selectors.Channels.getUnreadStatus', () => {

webapp/channels/src/packages/mattermost-redux/src/selectors/entities/channels.ts

@@ -42,7 +42,7 @@ import {
     haveICurrentChannelPermission,
     haveITeamPermission,
 } from 'mattermost-redux/selectors/entities/roles';
-import {getCurrentTeamId, getMyTeams, getTeamMemberships} from 'mattermost-redux/selectors/entities/teams';
+import {getCurrentTeamId, getMyTeams} from 'mattermost-redux/selectors/entities/teams';
 import {
     getCurrentUserId,
     getStatusForUserId,
@@ -612,8 +612,6 @@ export const getUnreadStatus: (state: GlobalState) => BasicUnreadStatus = create
     getUsers,
     getCurrentUserId,
     getCurrentTeamId,
-    getMyTeams,
-    getTeamMemberships,
     isCollapsedThreadsEnabled,
     getThreadCounts,
     getThreadCountsIncludingDirect,
@@ -624,15 +622,13 @@ export const getUnreadStatus: (state: GlobalState) => BasicUnreadStatus = create
         users,
         currentUserId,
         currentTeamId,
-        myTeams,
-        myTeamMemberships,
         collapsedThreads,
         threadCounts,
         threadCountsIncludingDirect,
     ) => {
         const {
-            messages: currentTeamUnreadMessages,
-            mentions: currentTeamUnreadMentions,
+            messages: unreadMessages,
+            mentions: unreadMentions,
         } = Object.entries(myMembers).reduce((counts, [channelId, membership]) => {
             const channel = channels[channelId];
 
@@ -640,15 +636,6 @@ export const getUnreadStatus: (state: GlobalState) => BasicUnreadStatus = create
                 return counts;
             }
 
-            if (
-                // other-team non-DM/non-GM channels
-                channel.team_id !== currentTeamId &&
-                channel.type !== General.DM_CHANNEL &&
-                channel.type !== General.GM_CHANNEL
-            ) {
-                return counts;
-            }
-
             const channelExists = channel.type === General.DM_CHANNEL ? users[getUserIdFromChannelName(currentUserId, channel.name)]?.delete_at === 0 : channel.delete_at === 0;
             if (!channelExists) {
                 return counts;
@@ -670,26 +657,8 @@ export const getUnreadStatus: (state: GlobalState) => BasicUnreadStatus = create
             mentions: 0,
         });
 
-        // Includes mention count and message count from teams other than the current team
-        // This count does not include GM's and DM's
-        const {
-            messages: otherTeamsUnreadMessages,
-            mentions: otherTeamsUnreadMentions,
-        } = myTeams.reduce((acc, team) => {
-            if (currentTeamId !== team.id) {
-                const member = myTeamMemberships[team.id];
-                acc.messages += collapsedThreads ? member.msg_count_root : member.msg_count;
-                acc.mentions += collapsedThreads ? member.mention_count_root : member.mention_count;
-            }
-
-            return acc;
-        }, {
-            messages: 0,
-            mentions: 0,
-        });
-
-        const totalUnreadMessages = currentTeamUnreadMessages + otherTeamsUnreadMessages;
-        let totalUnreadMentions = currentTeamUnreadMentions + otherTeamsUnreadMentions;
+        const totalUnreadMessages = unreadMessages;
+        let totalUnreadMentions = unreadMentions;
         let anyUnreadThreads = false;
 
         // when collapsed threads are enabled, we start with root-post counts from channels, then