diff --git a/web/selectors/nav-selectors.js b/web/selectors/nav-selectors.js
index d3e37665c..5e1e6a657 100644
--- a/web/selectors/nav-selectors.js
+++ b/web/selectors/nav-selectors.js
@@ -1,193 +1,192 @@
 // @flow
 
 import invariant from 'invariant';
 import * as React from 'react';
 import { useDispatch } from 'react-redux';
 import { createSelector } from 'reselect';
 
 import { nonThreadCalendarFiltersSelector } from 'lib/selectors/calendar-filter-selectors';
 import { currentCalendarQuery } from 'lib/selectors/nav-selectors';
 import { createPendingSidebar } from 'lib/shared/thread-utils';
 import type { CalendarQuery } from 'lib/types/entry-types';
 import type { CalendarFilter } from 'lib/types/filter-types';
 import type {
   ComposableMessageInfo,
   RobotextMessageInfo,
 } from 'lib/types/message-types';
 import type { ThreadInfo } from 'lib/types/thread-types';
 
 import { getDefaultTextMessageRules } from '../markdown/rules.react';
 import type { AppState } from '../redux/redux-setup';
 import { useSelector } from '../redux/redux-utils';
 import { updateNavInfoActionType } from '../types/nav-types';
 
 const dateExtractionRegex = /^([0-9]{4})-([0-9]{2})-[0-9]{2}$/;
 
 function yearExtractor(startDate: string, endDate: string): ?number {
   const startDateResults = dateExtractionRegex.exec(startDate);
   const endDateResults = dateExtractionRegex.exec(endDate);
   if (
     !startDateResults ||
     !startDateResults[1] ||
     !endDateResults ||
     !endDateResults[1] ||
     startDateResults[1] !== endDateResults[1]
   ) {
     return null;
   }
   return parseInt(startDateResults[1], 10);
 }
 
 function yearAssertingExtractor(startDate: string, endDate: string): number {
   const result = yearExtractor(startDate, endDate);
   invariant(
     result !== null && result !== undefined,
     `${startDate} and ${endDate} aren't in the same year`,
   );
   return result;
 }
 
 const yearAssertingSelector: (state: AppState) => number = createSelector(
   (state: AppState) => state.navInfo.startDate,
   (state: AppState) => state.navInfo.endDate,
   yearAssertingExtractor,
 );
 
 // 1-indexed
 function monthExtractor(startDate: string, endDate: string): ?number {
   const startDateResults = dateExtractionRegex.exec(startDate);
   const endDateResults = dateExtractionRegex.exec(endDate);
   if (
     !startDateResults ||
     !startDateResults[1] ||
     !startDateResults[2] ||
     !endDateResults ||
     !endDateResults[1] ||
     !endDateResults[2] ||
     startDateResults[1] !== endDateResults[1] ||
     startDateResults[2] !== endDateResults[2]
   ) {
     return null;
   }
   return parseInt(startDateResults[2], 10);
 }
 
 // 1-indexed
 function monthAssertingExtractor(startDate: string, endDate: string): number {
   const result = monthExtractor(startDate, endDate);
   invariant(
     result !== null && result !== undefined,
     `${startDate} and ${endDate} aren't in the same month`,
   );
   return result;
 }
 
 // 1-indexed
 const monthAssertingSelector: (state: AppState) => number = createSelector(
   (state: AppState) => state.navInfo.startDate,
   (state: AppState) => state.navInfo.endDate,
   monthAssertingExtractor,
 );
 
 function activeThreadSelector(state: AppState): ?string {
   return state.navInfo.tab === 'chat' ? state.navInfo.activeChatThreadID : null;
 }
 
 const webCalendarQuery: (
   state: AppState,
 ) => () => CalendarQuery = createSelector(
   currentCalendarQuery,
   (state: AppState) => state.navInfo.tab === 'calendar',
   (
     calendarQuery: (calendarActive: boolean) => CalendarQuery,
     calendarActive: boolean,
   ) => () => calendarQuery(calendarActive),
 );
 
 const nonThreadCalendarQuery: (
   state: AppState,
 ) => () => CalendarQuery = createSelector(
   webCalendarQuery,
   nonThreadCalendarFiltersSelector,
   (
     calendarQuery: () => CalendarQuery,
     filters: $ReadOnlyArray<CalendarFilter>,
   ) => {
     return (): CalendarQuery => {
       const query = calendarQuery();
       return {
         startDate: query.startDate,
         endDate: query.endDate,
         filters,
       };
     };
   },
 );
 
 function useOnClickThread(threadID: ?string) {
   const dispatch = useDispatch();
   return React.useCallback(
     (event: SyntheticEvent<HTMLElement>) => {
       invariant(
         threadID,
         'useOnClickThread should be called with threadID set',
       );
       event.preventDefault();
       dispatch({
         type: updateNavInfoActionType,
         payload: {
           activeChatThreadID: threadID,
         },
       });
     },
     [dispatch, threadID],
   );
 }
 
 function useThreadIsActive(threadID: string) {
   return useSelector((state) => threadID === state.navInfo.activeChatThreadID);
 }
 
 function useOnClickPendingSidebar(
   messageInfo: ComposableMessageInfo | RobotextMessageInfo,
   threadInfo: ThreadInfo,
 ) {
   const dispatch = useDispatch();
   const viewerID = useSelector((state) => state.currentUserInfo?.id);
   return React.useCallback(
     (event: SyntheticEvent<HTMLElement>) => {
       event.preventDefault();
       if (!viewerID) {
         return;
       }
       const pendingSidebarInfo = createPendingSidebar(
         messageInfo,
         threadInfo,
         viewerID,
         getDefaultTextMessageRules().simpleMarkdownRules,
       );
       dispatch({
         type: updateNavInfoActionType,
         payload: {
           activeChatThreadID: pendingSidebarInfo.id,
           pendingThread: pendingSidebarInfo,
-          sourceMessageID: messageInfo.id,
         },
       });
     },
     [viewerID, messageInfo, threadInfo, dispatch],
   );
 }
 
 export {
   yearExtractor,
   yearAssertingSelector,
   monthExtractor,
   monthAssertingSelector,
   activeThreadSelector,
   webCalendarQuery,
   nonThreadCalendarQuery,
   useOnClickThread,
   useThreadIsActive,
   useOnClickPendingSidebar,
 };
diff --git a/web/types/nav-types.js b/web/types/nav-types.js
index 6a74fad8a..cceb258ac 100644
--- a/web/types/nav-types.js
+++ b/web/types/nav-types.js
@@ -1,15 +1,14 @@
 // @flow
 
 import type { BaseNavInfo } from 'lib/types/nav-types';
 import type { ThreadInfo } from 'lib/types/thread-types';
 
 export type NavInfo = {|
   ...$Exact<BaseNavInfo>,
   +tab: 'calendar' | 'chat',
   +verify: ?string,
   +activeChatThreadID: ?string,
   +pendingThread?: ThreadInfo,
-  +sourceMessageID?: string,
 |};
 
 export const updateNavInfoActionType = 'UPDATE_NAV_INFO';