PLT-3506 Added flagged posts functionality (#3679)

* Added flagged posts functionality

* UI Improvements to flags (#3697)

* Added flag functionality for mobile

* Updating flagged text (#3699)

* Add back button to RHS thread when coming from flagged posts

* Updating position of flags (#3708)

* Plt 3506 - Reverting flag position (#3724)

* Revert "Updating position of flags (#3708)"

This reverts commit aaa05632c5d9eda35a048300a5bd7e99584c5b58.

* Fixing the icon in search

* Help text and white space improvements (#3730)

* Updatng help text and some white spacing.

* Updating help text

webapp/stores/post_store.jsx

@@ -441,8 +441,8 @@ class PostStoreClass extends EventEmitter {
         return threadPosts;
     }
 
-    emitSelectedPostChange(fromSearch) {
-        this.emit(SELECTED_POST_CHANGE_EVENT, fromSearch);
+    emitSelectedPostChange(fromSearch, fromFlaggedPosts) {
+        this.emit(SELECTED_POST_CHANGE_EVENT, fromSearch, fromFlaggedPosts);
     }
 
     addSelectedPostChangeListener(callback) {
@@ -599,7 +599,7 @@ PostStore.dispatchToken = AppDispatcher.register((payload) => {
         break;
     case ActionTypes.RECEIVED_POST_SELECTED:
         PostStore.storeSelectedPostId(action.postId);
-        PostStore.emitSelectedPostChange(action.from_search);
+        PostStore.emitSelectedPostChange(action.from_search, action.from_flagged_posts);
         break;
     default:
     }

webapp/stores/search_store.jsx

@@ -18,6 +18,7 @@ class SearchStoreClass extends EventEmitter {
 
         this.searchResults = null;
         this.isMentionSearch = false;
+        this.isFlaggedPosts = false;
         this.searchTerm = '';
     }
 
@@ -77,6 +78,10 @@ class SearchStoreClass extends EventEmitter {
         return this.isMentionSearch;
     }
 
+    getIsFlaggedPosts() {
+        return this.isFlaggedPosts;
+    }
+
     storeSearchTerm(term) {
         this.searchTerm = term;
     }
@@ -85,9 +90,10 @@ class SearchStoreClass extends EventEmitter {
         return this.searchTerm;
     }
 
-    storeSearchResults(results, isMentionSearch) {
+    storeSearchResults(results, isMentionSearch, isFlaggedPosts) {
         this.searchResults = results;
         this.isMentionSearch = isMentionSearch;
+        this.isFlaggedPosts = isFlaggedPosts;
     }
 }
 
@@ -98,7 +104,7 @@ SearchStore.dispatchToken = AppDispatcher.register((payload) => {
 
     switch (action.type) {
     case ActionTypes.RECEIVED_SEARCH:
-        SearchStore.storeSearchResults(action.results, action.is_mention_search);
+        SearchStore.storeSearchResults(action.results, action.is_mention_search, action.is_flagged_posts);
         SearchStore.emitSearchChange();
         break;
     case ActionTypes.RECEIVED_SEARCH_TERM: