output: fixes #4128, fixes #4129

src/vs/workbench/parts/output/common/outputEditorInput.ts

@@ -61,11 +61,18 @@ export class OutputEditorInput extends StringEditorInput {
 		this.toDispose.push(this.outputService.onActiveOutputChannel(() => this.scheduleOutputAppend()));
 		this.toDispose.push(this.eventService.addListener2(EventType.COMPOSITE_OPENED, (e: CompositeEvent) => {
 			if (e.compositeId === OUTPUT_PANEL_ID) {
-				this.scheduleOutputAppend();
+				this.appendOutput();
 			}
 		}));
 
 		this.appendOutputScheduler = new RunOnceScheduler(() => {
+			if (this.isVisible()) {
+				this.appendOutput();
+			}
+		}, OutputEditorInput.OUTPUT_DELAY);
+	}
+
+	private appendOutput(): void {
 		if (this.value.length + this.bufferedOutput.length > MAX_OUTPUT_LENGTH) {
 			this.setValue(this.outputService.getOutput(this.channel));
 		} else {
@@ -73,12 +80,9 @@ export class OutputEditorInput extends StringEditorInput {
 		}
 		this.bufferedOutput = '';
 
-			if (this.isVisible()) {
 		const panel = this.panelService.getActivePanel();
 		(<OutputPanel>panel).revealLastLine();
 	}
-		}, OutputEditorInput.OUTPUT_DELAY);
-	}
 
 	private onOutputReceived(e: IOutputEvent): void {
 		if (this.outputSet && e.channel === this.channel) {