fixes #107650

src/vs/workbench/contrib/files/browser/views/explorerView.ts

@@ -10,7 +10,6 @@ import { IAction, WorkbenchActionExecutedEvent, WorkbenchActionExecutedClassific
 import { memoize } from 'vs/base/common/decorators';
 import { IFilesConfiguration, ExplorerFolderContext, FilesExplorerFocusedContext, ExplorerFocusedContext, ExplorerRootContext, ExplorerResourceReadonlyContext, IExplorerService, ExplorerResourceCut, ExplorerResourceMoveableToTrash, ExplorerCompressedFocusContext, ExplorerCompressedFirstFocusContext, ExplorerCompressedLastFocusContext, ExplorerResourceAvailableEditorIdsContext } from 'vs/workbench/contrib/files/common/files';
 import { NewFolderAction, NewFileAction, FileCopiedContext, RefreshExplorerView, CollapseExplorerView } from 'vs/workbench/contrib/files/browser/fileActions';
-import { EditorResourceAccessor, SideBySideEditor } from 'vs/workbench/common/editor';
 import { DiffEditorInput } from 'vs/workbench/common/editor/diffEditorInput';
 import * as DOM from 'vs/base/browser/dom';
 import { IWorkbenchLayoutService } from 'vs/workbench/services/layout/browser/layoutService';
@@ -42,7 +41,6 @@ import { IStorageService, StorageScope } from 'vs/platform/storage/common/storag
 import { IAsyncDataTreeViewState } from 'vs/base/browser/ui/tree/asyncDataTree';
 import { FuzzyScore } from 'vs/base/common/filters';
 import { IClipboardService } from 'vs/platform/clipboard/common/clipboardService';
-import { withNullAsUndefined } from 'vs/base/common/types';
 import { IFileService, FileSystemProviderCapabilities } from 'vs/platform/files/common/files';
 import { DisposableStore, IDisposable } from 'vs/base/common/lifecycle';
 import { Event } from 'vs/base/common/event';
@@ -681,7 +679,7 @@ export class ExplorerView extends ViewPane {
 		}
 
 		// check for files
-		return withNullAsUndefined(EditorResourceAccessor.getOriginalUri(input, { supportSideBySide: SideBySideEditor.PRIMARY }));
+		return input?.resource;
 	}
 
 	public async selectResource(resource: URI | undefined, reveal = this.autoReveal, retry = 0): Promise<void> {

src/vs/workbench/contrib/files/common/explorerService.ts

@@ -19,7 +19,6 @@ import { IExpression } from 'vs/base/common/glob';
 import { IClipboardService } from 'vs/platform/clipboard/common/clipboardService';
 import { IEditorService } from 'vs/workbench/services/editor/common/editorService';
 import { IEditableData } from 'vs/workbench/common/views';
-import { EditorResourceAccessor } from 'vs/workbench/common/editor';
 import { IUriIdentityService } from 'vs/workbench/services/uriIdentity/common/uriIdentity';
 
 function getFileEventsExcludes(configurationService: IConfigurationService, root?: URI): IExpression {
@@ -196,7 +195,7 @@ export class ExplorerService implements IExplorerService {
 		this.model.roots.forEach(r => r.forgetChildren());
 		if (this.view) {
 			await this.view.refresh(true);
-			const resource = EditorResourceAccessor.getOriginalUri(this.editorService.activeEditor);
+			const resource = this.editorService.activeEditor?.resource;
 			const autoReveal = this.configurationService.getValue<IFilesConfiguration>().explorer.autoReveal;
 
 			if (reveal && resource && autoReveal) {