From 9bc8ff7e1eb98cda655bd1cadff8bfebfec09f6d Mon Sep 17 00:00:00 2001
From: Bruno Windels <brunow@matrix.org>
Date: Tue, 20 Aug 2019 17:15:52 +0200
Subject: [PATCH] clear composer undo history when sending a message

---
 src/components/views/rooms/BasicMessageComposer.js | 4 ++++
 src/components/views/rooms/SendMessageComposer.js  | 2 ++
 src/editor/history.js                              | 4 ++++
 3 files changed, 10 insertions(+)

diff --git a/src/components/views/rooms/BasicMessageComposer.js b/src/components/views/rooms/BasicMessageComposer.js
index 9ada9df720..a488990210 100644
--- a/src/components/views/rooms/BasicMessageComposer.js
+++ b/src/components/views/rooms/BasicMessageComposer.js
@@ -136,6 +136,10 @@ export default class BasicMessageEditor extends React.Component {
         return this._lastCaret;
     }
 
+    clearUndoHistory() {
+        this.historyManager.clear();
+    }
+
     getCaret() {
         return this._lastCaret;
     }
diff --git a/src/components/views/rooms/SendMessageComposer.js b/src/components/views/rooms/SendMessageComposer.js
index 4c6d763411..3b65b3e83d 100644
--- a/src/components/views/rooms/SendMessageComposer.js
+++ b/src/components/views/rooms/SendMessageComposer.js
@@ -100,6 +100,8 @@ export default class SendMessageComposer extends React.Component {
         const {roomId} = this.props.room;
         this.context.matrixClient.sendMessage(roomId, createMessageContent(this.model, this.props.permalinkCreator));
         this.model.reset([]);
+        this._editorRef.clearUndoHistory();
+
         if (isReply) {
             // Clear reply_to_event as we put the message into the queue
             // if the send fails, retry will handle resending.
diff --git a/src/editor/history.js b/src/editor/history.js
index 6fd67d067c..de052cf682 100644
--- a/src/editor/history.js
+++ b/src/editor/history.js
@@ -18,6 +18,10 @@ export const MAX_STEP_LENGTH = 10;
 
 export default class HistoryManager {
     constructor() {
+        this.clear();
+    }
+
+    clear() {
         this._stack = [];
         this._newlyTypedCharCount = 0;
         this._currentIndex = -1;