refs #1096 Reject duplicated status when append statuses in Home

spec/renderer/unit/store/TimelineSpace/Contents/Home.spec.ts

@@ -116,6 +116,7 @@ describe('TimelineSpace/Contents/Home', () => {
 
     describe('appendTimeline', () => {
       describe('heading', () => {
+        describe('normal', () => {
           beforeEach(() => {
             state = {
               lazyLoading: false,
@@ -134,7 +135,28 @@ describe('TimelineSpace/Contents/Home', () => {
           })
         })
 
+        describe('duplicated status', () => {
+          beforeEach(() => {
+            state = {
+              lazyLoading: false,
+              heading: true,
+              timeline: [status2, status1],
+              unreadTimeline: [],
+              filter: '',
+              showReblogs: true,
+              showReplies: true
+            }
+          })
+          it('should not update timeline', () => {
+            Home.mutations![MUTATION_TYPES.APPEND_TIMELINE](state, status2)
+            expect(state.timeline).toEqual([status2, status1])
+            expect(state.unreadTimeline).toEqual([])
+          })
+        })
+      })
+
       describe('not heading', () => {
+        describe('normal', () => {
           beforeEach(() => {
             state = {
               lazyLoading: false,
@@ -152,6 +174,25 @@ describe('TimelineSpace/Contents/Home', () => {
             expect(state.unreadTimeline).toEqual([status2])
           })
         })
+        describe('duplicated status', () => {
+          beforeEach(() => {
+            state = {
+              lazyLoading: false,
+              heading: false,
+              timeline: [],
+              unreadTimeline: [status2, status1],
+              filter: '',
+              showReblogs: true,
+              showReplies: true
+            }
+          })
+          it('should not update unreadTimeline', () => {
+            Home.mutations![MUTATION_TYPES.APPEND_TIMELINE](state, status2)
+            expect(state.timeline).toEqual([])
+            expect(state.unreadTimeline).toEqual([status2, status1])
+          })
+        })
+      })
     })
 
     describe('mergeTimeline', () => {

src/renderer/store/TimelineSpace/Contents/Home.ts

@@ -46,11 +46,14 @@ const mutations: MutationTree<HomeState> = {
     state.heading = value
   },
   [MUTATION_TYPES.APPEND_TIMELINE]: (state, update: Status) => {
+    // Reject duplicated status in timeline
+    if (!state.timeline.find(item => item.id === update.id) && !state.unreadTimeline.find(item => item.id === update.id)) {
       if (state.heading) {
         state.timeline = [update].concat(state.timeline)
       } else {
         state.unreadTimeline = [update].concat(state.unreadTimeline)
       }
+    }
   },
   [MUTATION_TYPES.UPDATE_TIMELINE]: (state, messages: Array<Status>) => {
     state.timeline = messages