From ce59c9d399b1e0d1d19049a084a30012738ade44 Mon Sep 17 00:00:00 2001
From: Gnome Ann <>
Date: Tue, 24 Aug 2021 13:32:29 -0400
Subject: [PATCH] Fix left/right arrow key bug This happens when you have a
 chunk that has no trailing newlines followed by a chunk with a single newline
 at the start. Moving between those chunks would cause the caret to jump to
 the wrong position sometimes.

---
 static/application.js | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/static/application.js b/static/application.js
index 39d5447e..6626f24f 100644
--- a/static/application.js
+++ b/static/application.js
@@ -646,11 +646,17 @@ function chunkOnKeyDown(event) {
 	switch(event.keyCode) {
 		case 37:  // left
 		case 39:  // right
-			old_selection_offset = getSelection().focusOffset;
+			old_range = getSelection().getRangeAt(0);
+			old_range_start = old_range.startOffset;
+			old_range_end = old_range.endOffset;
+			old_range_ancestor = old_range.commonAncestorContainer;
+			old_range_start_container = old_range.startContainer;
+			old_range_end_container = old_range.endContainer;
 			setTimeout(function () {
 				// Wait a few milliseconds and check if the caret has moved
 				new_selection = getSelection();
-				if(old_selection_offset != new_selection.focusOffset) {
+				new_range = new_selection.getRangeAt(0);
+				if(old_range_start != new_range.startOffset || old_range_end != new_range.endOffset || old_range_ancestor != new_range.commonAncestorContainer || old_range_start_container != new_range.startContainer || old_range_end_container != new_range.endContainer) {
 					return;
 				}
 				// If it hasn't moved, we're at the beginning or end of a chunk