Feat/close book (#9453)

* initial commit

* Add Reveal in Books editor tab context option

* Select item in books viewlet automatically

* changes

* easier than i thought it'd be

* added file watcher on toc file v1

* Merge from Feat/create book

* Undo Merge from Feat/create book

* Use fsPath instead of path

* repen book on toc update

* update book in-place

* fix close book

* error handling for closeBook

* PR comments

* addressed comments

* moved the watch block to try ,watch vs watchFile

Co-authored-by: chlafreniere <hichise@gmail.com>
Co-authored-by: Chris LaFreniere <40371649+chlafreniere@users.noreply.github.com>

extensions/notebook/src/book/bookModel.ts

@@ -37,6 +37,8 @@ export class BookModel implements azdata.nb.NavigationProvider {
 	}
 
 	public async initializeContents(): Promise<void> {
+		this._tableOfContentPaths = [];
+		this._bookItems = [];
 		await this.getTableOfContentFiles(this.bookPath);
 		await this.readBooks();
 	}
@@ -157,8 +159,8 @@ export class BookModel implements azdata.nb.NavigationProvider {
 							let uriToNotebook: vscode.Uri = vscode.Uri.file(pathToNotebook);
 							if (!this._allNotebooks.get(uriToNotebook.fsPath)) {
 								this._allNotebooks.set(uriToNotebook.fsPath, notebook);
-								notebooks.push(notebook);
 							}
+							notebooks.push(notebook);
 						}
 					} else if (await fs.pathExists(pathToMarkdown)) {
 						let markdown: BookTreeItem = new BookTreeItem({