Fix: New md file scrolls to Top. (microsoft#164999)

Fixes microsoft#164071.

Author: LoopThrough-i-j

extensions/markdown-language-features/preview-src/index.ts

@@ -57,12 +57,12 @@ function doAfterImagesLoaded(cb: () => void) {
 }
 
 onceDocumentLoaded(() => {
-	const scrollProgress = state.scrollProgress;
+	const scrollTo = !isNaN(state.line) ? state.line : state.scrollProgress;
 
-	if (typeof scrollProgress === 'number' && !settings.settings.fragment) {
+	if (typeof scrollTo === 'number' && !settings.settings.fragment) {
 		doAfterImagesLoaded(() => {
 			scrollDisabledCount += 1;
-			window.scrollTo(0, scrollProgress * document.body.clientHeight);
+			window.scrollTo(0, scrollTo * document.body.clientHeight);
 		});
 		return;
 	}

extensions/markdown-language-features/src/preview/preview.ts

@@ -755,6 +755,8 @@ export class DynamicMarkdownPreview extends Disposable implements IManagedMarkdo
 				default:
 					return;
 			}
+		} else if (!scrollLocation) {
+			scrollLocation = new StartingScrollLine(0);
 		}
 
 		this._preview.dispose();