From a44dc7f1742a5d7054539104086a570ee4404292 Mon Sep 17 00:00:00 2001
From: Damien Elmes <git@ichi2.net>
Date: Tue, 17 Jan 2017 13:39:38 +1000
Subject: [PATCH] prevent backspace key from going back a page

---
 aqt/webview.py | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/aqt/webview.py b/aqt/webview.py
index bd5b8b660..ef48438dc 100644
--- a/aqt/webview.py
+++ b/aqt/webview.py
@@ -169,6 +169,23 @@ body { zoom: %f; %s }
 %s</style>
 <script>
 %s
+
+// prevent backspace key from going back a page
+document.addEventListener("keydown", function(evt) {
+    if (evt.keyCode != 8) {
+        return;
+    }
+    var isText = 0;
+    var nn = evt.target.nodeName;
+    if (nn == "INPUT" || nn == "TEXTAREA") {
+        isText = 1;
+    } else if (nn == "DIV" && evt.target.contentEditable) {
+        isText = 1;
+    }
+    if (!isText) {
+        evt.preventDefault();
+    }
+});
 </script>
 %s