fix editor drag flicker

sbatten · sbatten · commit 3ba52212b38c · 2020-04-20T13:50:36.000-07:00
diff --git a/src/vs/workbench/browser/parts/editor/editorPart.ts b/src/vs/workbench/browser/parts/editor/editorPart.ts
@@ -831,6 +831,11 @@ export class EditorPart extends Part implements IEditorGroupsService, IEditorGro
 		parent.appendChild(overlay);
 
 		CompositeDragAndDropObserver.INSTANCE.registerTarget(this.element, {
+			onDragOver: e => {
+				if (e.eventData.dataTransfer) {
+					e.eventData.dataTransfer.dropEffect = 'none';
+				}
+			},
 			onDragStart: e => {
 				toggleClass(overlay, 'visible', true);
 			},
