remove border

src/vs/base/browser/ui/list/list.css

@@ -69,8 +69,6 @@
 	display: flex;
 	position: absolute;
 	border-radius: 2px;
-	border-width: 1px;
-	border-style: solid;
 	padding: 0px 3px;
 	max-width: calc(100% - 10px);
 	text-overflow: ellipsis;

src/vs/base/browser/ui/list/listWidget.ts

@@ -730,7 +730,7 @@ export class DefaultStyleController implements IStyleController {
 		}
 
 		if (styles.listMatchesOutline) {
-			content.push(`.monaco-list-type-filter { border-color: ${styles.listMatchesOutline}; }`);
+			content.push(`.monaco-list-type-filter { border: 1px solid ${styles.listMatchesOutline}; }`);
 		}
 
 		if (styles.listMatchesShadow) {

src/vs/platform/theme/common/styler.ts

@@ -249,7 +249,6 @@ export const defaultListStyles: IColorMapping = {
 	listSelectionOutline: activeContrastBorder,
 	listHoverOutline: activeContrastBorder,
 	listMatchesBackground: blend2(editorFindMatchHighlight, editorWidgetBackground),
-	listMatchesOutline: focusBorder,
 	listMatchesShadow: widgetShadow
 };