From 62f0a2278d8e320922e8ce0abfeb07fd8a6295b8 Mon Sep 17 00:00:00 2001
From: Philipinho <16838612+Philipinho@users.noreply.github.com>
Date: Tue, 12 May 2026 22:32:44 +0100
Subject: [PATCH] =?UTF-8?q?fix(editor):=20prevent=20stuck=20list=20after?=
 =?UTF-8?q?=20pasting=20plain=20text=20marked.parse()=20emits=20a=20traili?=
 =?UTF-8?q?ng=20newline=20that=20became=20a=20whitespace=20text=20node=20a?=
 =?UTF-8?q?t=20the=20body=20level,=20which=20parseSlice=20converted=20into?=
 =?UTF-8?q?=20a=20spurious=20paragraph=20at=20the=20end=20of=20the=20targe?=
 =?UTF-8?q?t=20=E2=80=94=20inside=20a=20list=20item=20this=20blocked=20the?=
 =?UTF-8?q?=20"Enter=20exits=20list"=20behavior=20since=20splitListItem's?=
 =?UTF-8?q?=20empty-last-block=20check=20never=20fired.=20Strip=20whitespa?=
 =?UTF-8?q?ce-only=20text=20nodes=20between=20block=20elements=20before=20?=
 =?UTF-8?q?parsing=20the=20slice,=20and=20place=20the=20cursor=20at=20the?=
 =?UTF-8?q?=20end=20of=20the=20inserted=20content.=20Also=20extend=20trans?=
 =?UTF-8?q?formPasted=20to=20drop=20trailing=20hardBreaks=20and=20whitespa?=
 =?UTF-8?q?ce=20text=20nodes=20for=20the=20HTML-clipboard=20path.?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../editor/extensions/markdown-clipboard.ts   | 53 +++++++++++++------
 1 file changed, 38 insertions(+), 15 deletions(-)

diff --git a/apps/client/src/features/editor/extensions/markdown-clipboard.ts b/apps/client/src/features/editor/extensions/markdown-clipboard.ts
index bebb567ab..ccbd70d03 100644
--- a/apps/client/src/features/editor/extensions/markdown-clipboard.ts
+++ b/apps/client/src/features/editor/extensions/markdown-clipboard.ts
@@ -81,6 +81,7 @@ export const MarkdownClipboard = Extension.create({
 
             const parsed = markdownToHtml(text.replace(/\n+$/, ""));
             const body = elementFromString(parsed);
+            stripBlockLevelWhitespaceNodes(body);
             normalizeTableColumnWidths(body);
 
             const contentNodes = DOMParser.fromSchema(
@@ -91,7 +92,7 @@ export const MarkdownClipboard = Extension.create({
 
             tr.replaceRange(from, to, contentNodes);
             const insertEnd = tr.mapping.map(from, 1);
-            tr.setSelection(TextSelection.near(tr.doc.resolve(Math.max(from, insertEnd - 2)), -1));
+            tr.setSelection(TextSelection.near(tr.doc.resolve(insertEnd), -1));
             tr.setMeta('paste', true)
             view.dispatch(tr);
             return true;
@@ -104,21 +105,28 @@ export const MarkdownClipboard = Extension.create({
           transformPasted: (slice) => {
             let { content, openStart, openEnd } = slice;
 
-            // Remove trailing paragraphs that contain only whitespace
-            while (content.childCount > 1) {
-              const lastChild = content.lastChild;
-              if (
-                lastChild?.type.name === "paragraph" &&
-                lastChild.textContent.trim() === ""
-              ) {
-                const children = [];
-                for (let i = 0; i < content.childCount - 1; i++) {
-                  children.push(content.child(i));
-                }
-                content = Fragment.from(children);
-              } else {
-                break;
+            const isTrailingNoise = (node: any) => {
+              if (!node) return false;
+              if (node.type.name === "hardBreak") return true;
+              if (node.isText && (node.text ?? "").trim() === "") return true;
+              if (node.type.name === "paragraph") {
+                let onlyNoise = true;
+                node.content.forEach((c: any) => {
+                  if (c.type.name === "hardBreak") return;
+                  if (c.isText && (c.text ?? "").trim() === "") return;
+                  onlyNoise = false;
+                });
+                return onlyNoise;
               }
+              return false;
+            };
+
+            while (content.childCount > 1 && isTrailingNoise(content.lastChild)) {
+              const children = [];
+              for (let i = 0; i < content.childCount - 1; i++) {
+                children.push(content.child(i));
+              }
+              content = Fragment.from(children);
             }
 
             if (content !== slice.content) {
@@ -140,6 +148,21 @@ function elementFromString(value) {
   return new window.DOMParser().parseFromString(wrappedValue, "text/html").body;
 }
 
+// marked.parse() emits "<p>...</p>\n<p>...</p>\n" — those literal newlines
+// become whitespace text nodes that parseSlice (preserveWhitespace: true)
+// converts into spurious empty paragraphs at the insertion site. Inside a
+// list item the trailing one prevents Enter from exiting the list.
+function stripBlockLevelWhitespaceNodes(body: HTMLElement): void {
+  Array.from(body.childNodes).forEach((node) => {
+    if (
+      node.nodeType === 3 /* TEXT_NODE */ &&
+      (node.textContent ?? "").trim() === ""
+    ) {
+      body.removeChild(node);
+    }
+  });
+}
+
 const DEFAULT_PASTE_COL_WIDTH_PX = 150;
 
 function parsePixelWidth(el: Element): number | null {