output: always auto reveal last line unless channel is locked

fixes #20150

src/vs/workbench/browser/parts/editor/textResourceEditor.ts

@@ -151,12 +151,11 @@ export class TextResourceEditor extends BaseTextEditor {
 	 * Reveals the last line of this editor if it has a model set.
 	 * If smart reveal is true will only reveal the last line if the line before last is visible #3351
 	 */
-	public revealLastLine(smartReveal = false): void {
+	public revealLastLine(): void {
 		const codeEditor = <ICodeEditor>this.getControl();
 		const model = codeEditor.getModel();
-		const lineBeforeLastRevealed = codeEditor.getScrollTop() + codeEditor.getLayoutInfo().height >= codeEditor.getScrollHeight();
 
-		if (model && (!smartReveal || lineBeforeLastRevealed)) {
+		if (model) {
 			const lastLine = model.getLineCount();
 			codeEditor.revealLine(lastLine);
 		}

src/vs/workbench/parts/output/browser/outputServices.ts

@@ -278,7 +278,7 @@ class OutputContentProvider implements ITextModelContentProvider {
 		if (!this.channelIdsWithScrollLock.has(channel)) {
 			// reveal last line
 			const panel = this.panelService.getActivePanel();
-			(<OutputPanel>panel).revealLastLine(true);
+			(<OutputPanel>panel).revealLastLine();
 		}
 	}