Set notebook as trusted after executing a cell. (#9108)

* Also set trusted by default when opening a notebook without any code cells.

src/sql/workbench/contrib/notebook/browser/models/cell.ts

@@ -339,6 +339,8 @@ export class CellModel implements ICellModel {
 				}
 				let content = this.source;
 				if ((Array.isArray(content) && content.length > 0) || (!Array.isArray(content) && content)) {
+					this.notebookModel.trustedMode = true;
+
 					// requestExecute expects a string for the code parameter
 					content = Array.isArray(content) ? content.join('') : content;
 					const future = kernel.requestExecute({

src/sql/workbench/contrib/notebook/browser/models/notebookModel.ts

@@ -308,6 +308,11 @@ export class NotebookModel extends Disposable implements INotebookModel {
 					});
 				}
 			}
+
+			// Trust notebook by default if there are no code cells
+			if (this._cells.length === 0 || this._cells.every(cell => cell.cellType === CellTypes.Markdown)) {
+				this.trustedMode = true;
+			}
 		} catch (error) {
 			this._inErrorState = true;
 			throw error;