From 2071a225ce015e1ae00a86c9953665e823e26b30 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=99=B3=E5=BB=B7=E5=AE=89?=
 <73953029+nrps9909@users.noreply.github.com>
Date: Fri, 28 Aug 2026 15:18:48 +0800
Subject: [PATCH] fix: preserve multi-character mention splits

---
 src/util.ts                |  2 +-
 tests/FullProcess.spec.tsx | 13 +++++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/util.ts b/src/util.ts
index 11c08f1b..be95bea0 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -80,7 +80,7 @@ export function replaceWithMeasure(text: string, measureConfig: MeasureConfig) {
 
   // Before text will append one space if have other text
   let beforeMeasureText = text.slice(0, measureLocation);
-  if (beforeMeasureText[beforeMeasureText.length - split.length] === split) {
+  if (split && beforeMeasureText.endsWith(split)) {
     beforeMeasureText = beforeMeasureText.slice(
       0,
       beforeMeasureText.length - split.length,
diff --git a/tests/FullProcess.spec.tsx b/tests/FullProcess.spec.tsx
index e7f6478b..b63b8cfc 100644
--- a/tests/FullProcess.spec.tsx
+++ b/tests/FullProcess.spec.tsx
@@ -88,6 +88,19 @@ describe('Full Process', () => {
     expect(onChange).toBeCalledWith('1 @bamboo 2');
   });
 
+  it('does not duplicate a multi-character split before a mention', () => {
+    const onChange = jest.fn();
+    const { container } = createMentions({ onChange, split: '::' });
+
+    simulateInput(container, 'hello::@b');
+    fireEvent.keyDown(container.querySelector('textarea'), {
+      keyCode: KeyCode.ENTER,
+      which: KeyCode.ENTER,
+    });
+
+    expect(onChange).toHaveBeenLastCalledWith('hello::@bamboo::');
+  });
+
   it('azerty Keyboards ', () => {
     const onChange = jest.fn();
     const { container } = createMentions({ onChange });