From e2b55d814bab2df1220d710cd93628bbc5d5dfc1 Mon Sep 17 00:00:00 2001
From: Elena Torro <elenatorro@gmail.com>
Date: Wed, 9 Jul 2025 11:39:16 +0200
Subject: [PATCH] :bug: Fix select all deletion error on Firefox

---
 .../src/editor/content/dom/Editor.js          | 26 +++++++++++++++++++
 .../src/editor/content/dom/TextNode.js        |  2 ++
 .../editor/controllers/SelectionController.js |  1 +
 3 files changed, 29 insertions(+)
 create mode 100644 frontend/text-editor/src/editor/content/dom/Editor.js

diff --git a/frontend/text-editor/src/editor/content/dom/Editor.js b/frontend/text-editor/src/editor/content/dom/Editor.js
new file mode 100644
index 0000000000..3070d4ed51
--- /dev/null
+++ b/frontend/text-editor/src/editor/content/dom/Editor.js
@@ -0,0 +1,26 @@
+/**
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * Copyright (c) KALEIDOS INC
+ */
+
+import { isElement } from "./Element.js";
+
+export const TAG = "DIV";
+export const TYPE = "editor";
+export const QUERY = `[data-itype="${TYPE}"]`;
+
+/**
+ * Returns true if passed node is the editor element.
+ *
+ * @param {Node} node
+ * @returns {boolean}
+ */
+export function isEditor(node) {
+  if (!node) return false;
+  if (!isElement(node, TAG)) return false;
+  if (node.dataset.itype !== TYPE) return false;
+  return true;
+}
diff --git a/frontend/text-editor/src/editor/content/dom/TextNode.js b/frontend/text-editor/src/editor/content/dom/TextNode.js
index fff86dbdff..82d918f89b 100644
--- a/frontend/text-editor/src/editor/content/dom/TextNode.js
+++ b/frontend/text-editor/src/editor/content/dom/TextNode.js
@@ -9,6 +9,7 @@
 import { isInline } from "./Inline.js";
 import { isLineBreak } from "./LineBreak.js";
 import { isParagraph } from "./Paragraph.js";
+import { isEditor } from "./Editor.js";
 import { isRoot } from "./Root.js";
 
 /**
@@ -60,5 +61,6 @@ export function getClosestTextNode(node) {
   if (isInline(node)) return node.firstChild;
   if (isParagraph(node)) return node.firstChild.firstChild;
   if (isRoot(node)) return node.firstChild.firstChild.firstChild;
+  if (isEditor(node)) return node.firstChild.firstChild.firstChild.firstChild;
   throw new Error("Cannot find a text node");
 }
diff --git a/frontend/text-editor/src/editor/controllers/SelectionController.js b/frontend/text-editor/src/editor/controllers/SelectionController.js
index dd01048552..4b4d4d6787 100644
--- a/frontend/text-editor/src/editor/controllers/SelectionController.js
+++ b/frontend/text-editor/src/editor/controllers/SelectionController.js
@@ -1519,6 +1519,7 @@ export class SelectionController extends EventTarget {
 
     const startNode = getClosestTextNode(this.#range.startContainer);
     const endNode = getClosestTextNode(this.#range.endContainer);
+
     const startOffset = this.#range.startOffset;
     const endOffset = this.#range.endOffset;