From ca9f48980d1fa5c790fb39b604e5dfc1ec21ed92 Mon Sep 17 00:00:00 2001
From: isidor <inikolic@microsoft.com>
Date: Fri, 25 Jan 2019 12:14:51 +0100
Subject: [PATCH] fixes #66902

---
 src/vs/base/browser/ui/tree/abstractTree.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/vs/base/browser/ui/tree/abstractTree.ts b/src/vs/base/browser/ui/tree/abstractTree.ts
index cf6122a3b6b..d03193cd180 100644
--- a/src/vs/base/browser/ui/tree/abstractTree.ts
+++ b/src/vs/base/browser/ui/tree/abstractTree.ts
@@ -511,6 +511,7 @@ class TypeFilterController<T, TFilterData> implements IDisposable {
 
 		const onDragOver = (event: DragEvent) => {
 			const x = event.screenX - left;
+			event.dataTransfer.dropEffect = 'none';
 
 			if (x < midContainerWidth) {
 				positionClassName = 'nw';
@@ -1050,4 +1051,4 @@ class TreeNavigator<T extends NonNullable<any>, TFilterData, TRef> implements IT
 		this.index = this.view.length - 1;
 		return this.current();
 	}
-}
\ No newline at end of file
+}
-- 
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