make sure codeEditor is set when bulk editing via diff editor (microsoft#191810)

re microsoft#188385

Author: jrieken

src/vs/workbench/contrib/bulkEdit/browser/bulkEditService.ts

@@ -8,7 +8,7 @@ import { IDisposable, toDisposable } from 'vs/base/common/lifecycle';
 import { LinkedList } from 'vs/base/common/linkedList';
 import { ResourceMap, ResourceSet } from 'vs/base/common/map';
 import { URI } from 'vs/base/common/uri';
-import { ICodeEditor, isCodeEditor } from 'vs/editor/browser/editorBrowser';
+import { ICodeEditor, isCodeEditor, isDiffEditor } from 'vs/editor/browser/editorBrowser';
 import { IBulkEditOptions, IBulkEditPreviewHandler, IBulkEditResult, IBulkEditService, ResourceEdit, ResourceFileEdit, ResourceTextEdit } from 'vs/editor/browser/services/bulkEditService';
 import { EditorOption } from 'vs/editor/common/config/editorOptions';
 import { WorkspaceEdit } from 'vs/editor/common/languages';
@@ -197,6 +197,8 @@ export class BulkEditService implements IBulkEditService {
 			const candidate = this._editorService.activeTextEditorControl;
 			if (isCodeEditor(candidate)) {
 				codeEditor = candidate;
+			} else if (isDiffEditor(candidate)) {
+				codeEditor = candidate.getModifiedEditor();
 			}
 		}