From b7c33974713263af7caaa686730817d8268c48b4 Mon Sep 17 00:00:00 2001
From: Daniel Imms <2193314+Tyriar@users.noreply.github.com>
Date: Thu, 9 Dec 2021 13:14:43 -0800
Subject: [PATCH] Clear unprocessed dead key state on input or press

Fixes #3573
---
 src/browser/Terminal.ts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/browser/Terminal.ts b/src/browser/Terminal.ts
index 23122f3f..130cb3db 100644
--- a/src/browser/Terminal.ts
+++ b/src/browser/Terminal.ts
@@ -1169,6 +1169,10 @@ export class Terminal extends CoreTerminal implements ITerminal {
 
     this._keyPressHandled = true;
 
+    // The key was handled so clear the dead key state, otherwise certain keystrokes like arrow
+    // keys could be ignored
+    this._unprocessedDeadKey = false;
+
     return true;
   }
 
@@ -1186,6 +1190,10 @@ export class Terminal extends CoreTerminal implements ITerminal {
         return false;
       }
 
+      // The key was handled so clear the dead key state, otherwise certain keystrokes like arrow
+      // keys could be ignored
+      this._unprocessedDeadKey = false;
+
       const text = ev.data;
       this.coreService.triggerDataEvent(text, true);