MM-31275 New sidebar performance improvements

actions/views/channel_sidebar.ts

@@ -142,7 +142,14 @@ export function adjustTargetIndexForMove(state: GlobalState, categoryId: string,
 }
 
 export function clearChannelSelection() {
-    return (dispatch: DispatchFunc) => {
+    return (dispatch: DispatchFunc, getState: () => GlobalState) => {
+        const state = getState();
+
+        if (state.views.channelSidebar.multiSelectedChannelIds.length === 0) {
+            // No selection to clear
+            return Promise.resolve({data: true});
+        }
+
         return dispatch({
             type: ActionTypes.MULTISELECT_CHANNEL_CLEAR,
         });

components/legacy_sidebar/sidebar.jsx

@@ -8,6 +8,7 @@ import ReactDOM from 'react-dom';
 import {FormattedMessage, injectIntl} from 'react-intl';
 import {PropTypes} from 'prop-types';
 import classNames from 'classnames';
+import throttle from 'lodash/throttle';
 
 import Scrollbars from 'react-custom-scrollbars';
 import {SpringSystem, MathUtil} from 'rebound';
@@ -270,9 +271,9 @@ class LegacySidebar extends React.PureComponent {
         }
     }
 
-    onScroll = () => {
+    onScroll = throttle(() => {
         this.updateUnreadIndicators();
-    }
+    }, 100);
 
     handleScrollAnimationUpdate = (spring) => {
         const {scrollbar} = this.refs;

components/sidebar/index.ts

@@ -13,7 +13,7 @@ import {getLicense} from 'mattermost-redux/selectors/entities/general';
 import {getBool} from 'mattermost-redux/selectors/entities/preferences';
 import {haveIChannelPermission} from 'mattermost-redux/selectors/entities/roles';
 import {getCurrentTeam} from 'mattermost-redux/selectors/entities/teams';
-import {GenericAction, ActionFunc} from 'mattermost-redux/types/actions';
+import {GenericAction} from 'mattermost-redux/types/actions';
 
 import {createCategory, clearChannelSelection} from 'actions/views/channel_sidebar';
 import {isUnreadFilterEnabled} from 'selectors/views/channel_sidebar';
@@ -66,7 +66,7 @@ type Actions = {
 
 function mapDispatchToProps(dispatch: Dispatch<GenericAction>) {
     return {
-        actions: bindActionCreators<ActionCreatorsMapObject<ActionFunc>, Actions>({
+        actions: bindActionCreators<ActionCreatorsMapObject, Actions>({
             clearChannelSelection,
             createCategory,
             fetchMyCategories,

components/sidebar/sidebar_channel_list/sidebar_channel_list.tsx

@@ -7,7 +7,7 @@ import Scrollbars from 'react-custom-scrollbars';
 import {DragDropContext, Droppable, DropResult, DragStart, BeforeCapture} from 'react-beautiful-dnd';
 import {Spring, SpringSystem} from 'rebound';
 import classNames from 'classnames';
-import debounce from 'lodash/debounce';
+import throttle from 'lodash/throttle';
 
 import {General} from 'mattermost-redux/constants';
 import {Channel} from 'mattermost-redux/types/channels';
@@ -357,11 +357,11 @@ export default class SidebarChannelList extends React.PureComponent<Props, State
         );
     }
 
-    onScroll = () => {
+    onScroll = throttle(() => {
         this.updateUnreadIndicators();
-    }
+    }, 100);
 
-    onTransitionEnd = debounce(() => {
+    onTransitionEnd = throttle(() => {
         this.updateUnreadIndicators();
     }, 100);
 

components/sidebar/sidebar_menu/sidebar_menu.tsx

@@ -59,22 +59,6 @@ export default class SidebarMenu extends React.PureComponent<Props, State> {
         }
     }
 
-    // TODO: Temporary code to keep the menu in place while scrolling
-    // This shouldn't be necessary once the menus are fixed up
-    componentDidMount() {
-        const scrollbars = document.querySelectorAll('#SidebarContainer .SidebarNavContainer .scrollbar--view');
-        if (scrollbars && scrollbars[0]) {
-            scrollbars[0].addEventListener('scroll', this.closeMenu);
-        }
-    }
-
-    componentWillUnmount() {
-        const scrollbars = document.querySelectorAll('#SidebarContainer .SidebarNavContainer .scrollbar--view');
-        if (scrollbars && scrollbars[0]) {
-            scrollbars[0].removeEventListener('scroll', this.closeMenu);
-        }
-    }
-
     closeMenu = () => {
         if (this.menuWrapperRef.current) {
             this.menuWrapperRef.current.close();

reducers/views/channel_sidebar.test.ts

@@ -99,4 +99,17 @@ describe('multiSelectedChannelIds', () => {
             'channel-2',
         ]);
     });
+
+    test('should not update state when clearing without a selection', () => {
+        const initialState: string[] = [];
+
+        const state = Reducers.multiSelectedChannelIds(
+            initialState,
+            {
+                type: ActionTypes.MULTISELECT_CHANNEL_CLEAR,
+            },
+        );
+
+        expect(state).toBe(initialState);
+    });
 });

reducers/views/channel_sidebar.ts

@@ -106,7 +106,10 @@ export function multiSelectedChannelIds(state: string[] = [], action: GenericAct
         return removeItem(state, action.data);
     case ActionTypes.MULTISELECT_CHANNEL_TO:
         return action.data;
+
     case ActionTypes.MULTISELECT_CHANNEL_CLEAR:
+        return state.length > 0 ? [] : state;
+
     case UserTypes.LOGOUT_SUCCESS:
         return [];
     default: