From c697f8cd3522b1ec61cb8a97275a27d72032b663 Mon Sep 17 00:00:00 2001
From: aojunhao123 <1844749591@qq.com>
Date: Mon, 12 Jan 2026 17:26:36 +0800
Subject: [PATCH] fix: popup container scroll due to precision

---
 .gitignore            | 1 +
 src/hooks/useAlign.ts | 8 ++++----
 tests/align.test.tsx  | 4 ++--
 3 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/.gitignore b/.gitignore
index f44d17fe..584bc34c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -27,6 +27,7 @@ es
 coverage
 yarn.lock
 package-lock.json
+pnpm-lock.yaml
 bun.lockb
 
 # dumi
diff --git a/src/hooks/useAlign.ts b/src/hooks/useAlign.ts
index 6d478ff9..45c81f2b 100644
--- a/src/hooks/useAlign.ts
+++ b/src/hooks/useAlign.ts
@@ -677,13 +677,13 @@ export default function useAlign(
         popupMirrorRect.bottom - popupRect.y - (nextOffsetY + popupRect.height);
 
       if (scaleX === 1) {
-        nextOffsetX = Math.round(nextOffsetX);
-        offsetX4Right = Math.round(offsetX4Right);
+        nextOffsetX = Math.floor(nextOffsetX);
+        offsetX4Right = Math.floor(offsetX4Right);
       }
 
       if (scaleY === 1) {
-        nextOffsetY = Math.round(nextOffsetY);
-        offsetY4Bottom = Math.round(offsetY4Bottom);
+        nextOffsetY = Math.floor(nextOffsetY);
+        offsetY4Bottom = Math.floor(offsetY4Bottom);
       }
 
       const nextOffsetInfo = {
diff --git a/tests/align.test.tsx b/tests/align.test.tsx
index 945b132e..e6ce0c77 100644
--- a/tests/align.test.tsx
+++ b/tests/align.test.tsx
@@ -272,7 +272,7 @@ describe('Trigger.Align', () => {
     });
   });
 
-  it('round when decimal precision', async () => {
+  it('floor when decimal precision', async () => {
     rectX = 22.6;
     rectY = 33.4;
     rectWidth = 33.7;
@@ -293,7 +293,7 @@ describe('Trigger.Align', () => {
     await awaitFakeTimer();
 
     expect(document.querySelector('.rc-trigger-popup')).toHaveStyle({
-      top: `56px`,
+      top: `55px`,
     });
   });
 });