Fix microsoft#180861. Cell stays in editing mode if it is not modified by find. (microsoft#180902)

Author: rebornix

src/vs/workbench/contrib/notebook/browser/contrib/find/findModel.ts

@@ -148,7 +148,13 @@ export class FindModel extends Disposable {
 				if (cell && cell.cellKind === CellKind.Markup) {
 					const foundContentMatch = contentMatches.find(m => m.cell.handle === cell.handle && m.contentMatches.length > 0);
 					const targetState = foundContentMatch ? CellEditState.Editing : CellEditState.Preview;
-					if (cell.getEditState() !== targetState) {
+					const currentEditingState = cell.getEditState();
+
+					if (currentEditingState === CellEditState.Editing && cell.editStateSource !== 'find') {
+						// it's already in editing mode, we should not update
+						continue;
+					}
+					if (currentEditingState !== targetState) {
 						cell.updateEditState(targetState, 'find');
 					}
 				}