Add "Stop Editing All Cells" command for notebooks (microsoft#259585)

* Initial plan

* Add Stop Editing All Cells command implementation

Co-authored-by: amunger <2019016+amunger@users.noreply.github.com>

* set focus on cell container

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: amunger <2019016+amunger@users.noreply.github.com>

Author: Copilot

src/vs/workbench/contrib/notebook/browser/controller/editActions.ts

@@ -45,6 +45,7 @@ import { NotebookInlineVariablesController } from '../contrib/notebookVariables/
 const CLEAR_ALL_CELLS_OUTPUTS_COMMAND_ID = 'notebook.clearAllCellsOutputs';
 const EDIT_CELL_COMMAND_ID = 'notebook.cell.edit';
 const DELETE_CELL_COMMAND_ID = 'notebook.cell.delete';
+const QUIT_EDIT_ALL_CELLS_COMMAND_ID = 'notebook.quitEditAllCells';
 export const CLEAR_CELL_OUTPUTS_COMMAND_ID = 'notebook.cell.clearOutputs';
 export const SELECT_NOTEBOOK_INDENTATION_ID = 'notebook.selectIndentation';
 export const COMMENT_SELECTED_CELLS_ID = 'notebook.commentSelectedCells';
@@ -151,6 +152,41 @@ registerAction2(class QuitEditCellAction extends NotebookCellAction {
 	}
 });
 
+registerAction2(class QuitEditAllCellsAction extends NotebookAction {
+	constructor() {
+		super(
+			{
+				id: QUIT_EDIT_ALL_CELLS_COMMAND_ID,
+				title: localize('notebookActions.quitEditAllCells', "Stop Editing All Cells")
+			});
+	}
+
+	async runWithContext(accessor: ServicesAccessor, context: INotebookActionContext) {
+		if (!context.notebookEditor.hasModel()) {
+			return;
+		}
+
+		const viewModel = context.notebookEditor.getViewModel();
+		if (!viewModel) {
+			return;
+		}
+
+		const activeCell = context.notebookEditor.getActiveCell();
+
+		const editingCells = viewModel.viewCells.filter(cell =>
+			cell.cellKind === CellKind.Markup && cell.getEditState() === CellEditState.Editing
+		);
+
+		editingCells.forEach(cell => {
+			cell.updateEditState(CellEditState.Preview, QUIT_EDIT_ALL_CELLS_COMMAND_ID);
+		});
+
+		if (activeCell) {
+			await context.notebookEditor.focusNotebookCell(activeCell, 'container', { skipReveal: true });
+		}
+	}
+});
+
 registerAction2(class DeleteCellAction extends NotebookCellAction {
 	constructor() {
 		super(