Add a focus_composer dispatcher action

and use it

src/components/structures/LeftPanel.js

@@ -27,6 +27,7 @@ import SettingsStore from '../../settings/SettingsStore';
 import {_t} from "../../languageHandler";
 import Analytics from "../../Analytics";
 import RoomList2 from "../views/rooms/RoomList2";
+import {Action} from "../../dispatcher/actions";
 
 
 const LeftPanel = createReactClass({
@@ -198,7 +199,7 @@ const LeftPanel = createReactClass({
 
     onSearchCleared: function(source) {
         if (source === "keyboard") {
-            dis.dispatch({action: 'focus_composer'});
+            dis.fire(Action.FocusComposer);
         }
         this.setState({searchExpanded: false});
     },

src/components/structures/LoggedInView.tsx

@@ -51,6 +51,7 @@ import {
     showToast as showServerLimitToast,
     hideToast as hideServerLimitToast
 } from "../../toasts/ServerLimitToast";
+import { Action } from "../../dispatcher/actions";
 
 // We need to fetch each pinned message individually (if we don't already have it)
 // so each pinned message may trigger a request. Limit the number per room for sanity.
@@ -346,7 +347,7 @@ class LoggedInView extends React.PureComponent<IProps, IState> {
             // refocusing during a paste event will make the
             // paste end up in the newly focused element,
             // so dispatch synchronously before paste happens
-            dis.dispatch({action: 'focus_composer'}, true);
+            dis.fire(Action.FocusComposer, true);
         }
     };
 
@@ -496,7 +497,7 @@ class LoggedInView extends React.PureComponent<IProps, IState> {
 
             if (!isClickShortcut && ev.key !== Key.TAB && !canElementReceiveInput(ev.target)) {
                 // synchronous dispatch so we focus before key generates input
-                dis.dispatch({action: 'focus_composer'}, true);
+                dis.fire(Action.FocusComposer, true);
                 ev.stopPropagation();
                 // we should *not* preventDefault() here as
                 // that would prevent typing in the now-focussed composer

src/components/structures/MatrixChat.tsx

@@ -347,7 +347,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
             Analytics.trackPageChange(durationMs);
         }
         if (this.focusComposer) {
-            dis.dispatch({action: 'focus_composer'});
+            dis.fire(Action.FocusComposer);
             this.focusComposer = false;
         }
     }
@@ -1363,7 +1363,7 @@ export default class MatrixChat extends React.PureComponent<IProps, IState> {
                 showNotificationsToast();
             }
 
-            dis.dispatch({action: 'focus_composer'});
+            dis.fire(Action.FocusComposer);
             this.setState({
                 ready: true,
             });

src/components/structures/RoomStatusBar.js

@@ -27,6 +27,7 @@ import Resend from '../../Resend';
 import * as cryptodevices from '../../cryptodevices';
 import dis from '../../dispatcher/dispatcher';
 import {messageForResourceLimitError, messageForSendError} from '../../utils/ErrorUtils';
+import {Action} from "../../dispatcher/actions";
 
 const STATUS_BAR_HIDDEN = 0;
 const STATUS_BAR_EXPANDED = 1;
@@ -135,12 +136,12 @@ export default createReactClass({
 
     _onResendAllClick: function() {
         Resend.resendUnsentEvents(this.props.room);
-        dis.dispatch({action: 'focus_composer'});
+        dis.fire(Action.FocusComposer);
     },
 
     _onCancelAllClick: function() {
         Resend.cancelUnsentEvents(this.props.room);
-        dis.dispatch({action: 'focus_composer'});
+        dis.fire(Action.FocusComposer);
     },
 
     _onShowDevicesClick: function() {

src/components/structures/RoomView.js

@@ -55,6 +55,7 @@ import {haveTileForEvent} from "../views/rooms/EventTile";
 import RoomContext from "../../contexts/RoomContext";
 import MatrixClientContext from "../../contexts/MatrixClientContext";
 import { shieldStatusForRoom } from '../../utils/ShieldUtils';
+import {Action} from "../../dispatcher/actions";
 
 const DEBUG = false;
 let debuglog = function() {};
@@ -1171,7 +1172,7 @@ export default createReactClass({
             ev.dataTransfer.files, this.state.room.roomId, this.context,
         );
         this.setState({ draggingFile: false });
-        dis.dispatch({action: 'focus_composer'});
+        dis.fire(Action.FocusComposer);
     },
 
     onDragLeaveOrEnd: function(ev) {
@@ -1377,7 +1378,7 @@ export default createReactClass({
                 event: null,
             });
         }
-        dis.dispatch({action: 'focus_composer'});
+        dis.fire(Action.FocusComposer);
     },
 
     onLeaveClick: function() {
@@ -1488,7 +1489,7 @@ export default createReactClass({
     // jump down to the bottom of this room, where new events are arriving
     jumpToLiveTimeline: function() {
         this._messagePanel.jumpToLiveTimeline();
-        dis.dispatch({action: 'focus_composer'});
+        dis.fire(Action.FocusComposer);
     },
 
     // jump up to wherever our read marker is