refactor: Move getPrivateMessages to messageSelectors.

Before it was in `baseSelectors`, which is not a right place for it.
All selectors related to `message` are present in `messageSelectors`,
so it's better to move it.

src/message/messageSelectors.js

@@ -2,10 +2,22 @@
 import { createSelector } from 'reselect';
 
 import type { Narrow, RenderedSectionDescriptor, Selector } from '../types';
-import { getFlags, getMute, getSubscriptions } from '../directSelectors';
+import {
+  getAllNarrows,
+  getFlags,
+  getMessages,
+  getMute,
+  getSubscriptions,
+} from '../directSelectors';
 import { getShownMessagesForNarrow } from '../chat/narrowsSelectors';
 import renderMessages from './renderMessages';
 import { findAnchor } from '../utils/message';
+import { ALL_PRIVATE_NARROW_STR } from '../utils/narrow';
+import { NULL_ARRAY } from '../nullObjects';
+
+export const getPrivateMessages = createSelector(getAllNarrows, getMessages, (narrows, messages) =>
+  (narrows[ALL_PRIVATE_NARROW_STR] || NULL_ARRAY).map(id => messages[id]),
+);
 
 export const getRenderedMessages = (narrow: Narrow): Selector<RenderedSectionDescriptor[]> =>
   createSelector(getShownMessagesForNarrow(narrow), messages => renderMessages(messages, narrow));

src/pm-conversations/pmConversationsSelectors.js

@@ -2,7 +2,7 @@
 import { createSelector } from 'reselect';
 
 import type { Message, PmConversationData } from '../types';
-import { getPrivateMessages } from '../baseSelectors';
+import { getPrivateMessages } from '../message/messageSelectors';
 import { getOwnEmail } from '../account/accountsSelectors';
 import { getUnreadByPms, getUnreadByHuddles } from '../unread/unreadSelectors';
 import { normalizeRecipientsSansMe, getRecipientsIds } from '../utils/recipient';

src/selectors.js

@@ -1,6 +1,5 @@
 /* @flow */
 export * from './account/accountsSelectors';
-export * from './baseSelectors';
 export * from './pm-conversations/pmConversationsSelectors';
 export * from './caughtup/caughtUpSelectors';
 export * from './chat/narrowsSelectors';

src/unread/unreadSelectors.js

@@ -12,8 +12,8 @@ import {
   getUnreadHuddles,
   getUnreadMentions,
 } from '../directSelectors';
-import { getPrivateMessages } from '../baseSelectors';
 import { getOwnEmail } from '../account/accountsSelectors';
+import { getPrivateMessages } from '../message/messageSelectors';
 import { getSubscriptionsById } from '../subscriptions/subscriptionSelectors';
 import { countUnread } from '../utils/unread';
 import { isTopicMuted } from '../utils/message';