Fix #38966

src/vs/workbench/parts/markers/browser/markersPanel.ts

@@ -122,11 +122,17 @@ export class MarkersPanel extends Panel {
 	}
 
 	public setVisible(visible: boolean): TPromise<void> {
-		let promise: TPromise<void> = super.setVisible(visible);
-		if (!visible) {
+		const wasVisible = this.isVisible();
+		return super.setVisible(visible)
+			.then(() => {
+				if (this.isVisible()) {
+					if (!wasVisible) {
+						this.refreshPanel();
+					}
+				} else {
 					this.rangeHighlightDecorations.removeHighlightRange();
 				}
-		return promise;
+			});
 	}
 
 	public getActions(): IAction[] {
@@ -166,6 +172,7 @@ export class MarkersPanel extends Panel {
 	}
 
 	private refreshPanel(): TPromise<any> {
+		if (this.isVisible()) {
 			this.collapseAllAction.enabled = this.markersModel.hasFilteredResources();
 			dom.toggleClass(this.treeContainer, 'hidden', !this.markersModel.hasFilteredResources());
 			this.renderMessage();
@@ -174,6 +181,7 @@ export class MarkersPanel extends Panel {
 					this.autoExpand();
 				});
 			}
+		}
 		return TPromise.as(null);
 	}