From 861dc41cfd8f9727f9094492904c17e016ecc501 Mon Sep 17 00:00:00 2001
From: Abe Jellinek <jellinek@berkeley.edu>
Date: Thu, 14 Sep 2023 14:03:07 -0400
Subject: [PATCH] Allow starting from end when annotating with touch

---
 src/dom/common/dom-view.tsx | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/dom/common/dom-view.tsx b/src/dom/common/dom-view.tsx
index e0d232b5..f6014427 100644
--- a/src/dom/common/dom-view.tsx
+++ b/src/dom/common/dom-view.tsx
@@ -916,6 +916,10 @@ abstract class DOMView<State extends DOMViewState, Data> {
 					let range = this._iframeDocument.createRange();
 					range.setStart(this._touchAnnotationStartPosition.offsetNode, this._touchAnnotationStartPosition.offset);
 					range.setEnd(endPos.offsetNode, endPos.offset);
+					if (range.collapsed) {
+						range.setStart(endPos.offsetNode, endPos.offset);
+						range.setEnd(this._touchAnnotationStartPosition.offsetNode, this._touchAnnotationStartPosition.offset);
+					}
 					let annotation = this._getAnnotationFromRange(range, this._tool.type, this._tool.color);
 					if (annotation) {
 						this._previewAnnotation = annotation;