From baecf477914f67f27b0f5d68a16f2ae6280989f4 Mon Sep 17 00:00:00 2001
From: Zihua Li <i@zihua.li>
Date: Mon, 29 Nov 2021 11:09:01 +0800
Subject: [PATCH] Fix getBounds of empty text nodes

---
 core/selection.js | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/core/selection.js b/core/selection.js
index 8c3624dbe9..b099fad6e4 100644
--- a/core/selection.js
+++ b/core/selection.js
@@ -152,6 +152,14 @@ class Selection {
     let side = 'left';
     let rect;
     if (node instanceof Text) {
+      // Return null if the text node is empty because it is
+      // not able to get a useful client rect:
+      // https://github.com/w3c/csswg-drafts/issues/2514.
+      // Empty text nodes are most likely caused by TextBlot#optimize()
+      // not getting called when editor content changes.
+      if (!node.data.length) {
+        return null;
+      }
       if (offset < node.data.length) {
         range.setStart(node, offset);
         range.setEnd(node, offset + 1);