From 04b6d7b29dfec2e4a2cb7f83d5746205277948a8 Mon Sep 17 00:00:00 2001
From: Bixente Elgart <b.elgart@net.estia.fr>
Date: Fri, 31 Jul 2026 12:58:17 +0200
Subject: [PATCH] add active modified-pane test

---
 .../diff-editor-shift-wheel-scroll.test.ts       | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/renderer/src/components/editor/diff-editor-shift-wheel-scroll.test.ts b/src/renderer/src/components/editor/diff-editor-shift-wheel-scroll.test.ts
index 5ab2174c1bf..73b93cb5a91 100644
--- a/src/renderer/src/components/editor/diff-editor-shift-wheel-scroll.test.ts
+++ b/src/renderer/src/components/editor/diff-editor-shift-wheel-scroll.test.ts
@@ -93,6 +93,22 @@ describe('installDiffEditorShiftWheelScroll', () => {
     dispose()
   })
 
+  it('scrolls the modified pane independently', () => {
+    const original = createPaneFixture()
+    const modified = createPaneFixture()
+    const dispose = installDiffEditorShiftWheelScroll({
+      getOriginalEditor: () => original,
+      getModifiedEditor: () => modified
+    })
+
+    const event = dispatchWheel(modified.input, { deltaY: 24, shiftKey: true })
+
+    expect(event.defaultPrevented).toBe(true)
+    expect(modified.setScrollLeft).toHaveBeenCalledWith(34)
+    expect(original.setScrollLeft).not.toHaveBeenCalled()
+    dispose()
+  })
+
   it('removes both pane listeners when disposed', () => {
     const original = createPaneFixture()
     const modified = createPaneFixture()