Use better editor API

src/vs/workbench/contrib/welcome/walkThrough/browser/walkThroughInput.ts

@@ -11,6 +11,7 @@ import { ITextModelService } from 'vs/editor/common/services/resolverService';
 import * as marked from 'vs/base/common/marked/marked';
 import { Schemas } from 'vs/base/common/network';
 import { isEqual } from 'vs/base/common/resources';
+import { EndOfLinePreference } from 'vs/editor/common/model';
 
 export class WalkThroughModel extends EditorModel {
 
@@ -111,7 +112,7 @@ export class WalkThroughInput extends EditorInput {
 						return '';
 					};
 
-					const markdown = ref.object.textEditorModel.getLinesContent().join('\n');
+					const markdown = ref.object.textEditorModel.getValue(EndOfLinePreference.LF);
 					marked(markdown, { renderer });
 
 					return Promise.all(snippets)

src/vs/workbench/contrib/welcome/walkThrough/browser/walkThroughPart.ts

@@ -39,6 +39,7 @@ import { Dimension, size } from 'vs/base/browser/dom';
 import { IEditorGroupsService } from 'vs/workbench/services/editor/common/editorGroupsService';
 import { CancellationToken } from 'vs/base/common/cancellation';
 import { domEvent } from 'vs/base/browser/event';
+import { EndOfLinePreference } from 'vs/editor/common/model';
 
 export const WALK_THROUGH_FOCUS = new RawContextKey<boolean>('interactivePlaygroundFocus', false);
 
@@ -278,7 +279,7 @@ export class WalkThroughPart extends BaseEditor {
 					return;
 				}
 
-				const content = model.main.textEditorModel.getLinesContent().join('\n');
+				const content = model.main.textEditorModel.getValue(EndOfLinePreference.LF);
 				if (!strings.endsWith(input.getResource().path, '.md')) {
 					this.content.innerHTML = content;
 					this.updateSizeClasses();