fix #110750.

Author: rebornix

src/vs/workbench/contrib/notebook/browser/notebookServiceImpl.ts

@@ -28,7 +28,7 @@ import { NotebookKernelProviderAssociationRegistry, NotebookViewTypesExtensionRe
 import { CellViewModel } from 'vs/workbench/contrib/notebook/browser/viewModel/notebookViewModel';
 import { NotebookCellTextModel } from 'vs/workbench/contrib/notebook/common/model/notebookCellTextModel';
 import { NotebookTextModel } from 'vs/workbench/contrib/notebook/common/model/notebookTextModel';
-import { ACCESSIBLE_NOTEBOOK_DISPLAY_ORDER, BUILTIN_RENDERER_ID, CellKind, CellOutputKind, DisplayOrderKey, IDisplayOutput, INotebookDecorationRenderOptions, INotebookKernelInfo2, INotebookKernelProvider, INotebookRendererInfo, INotebookTextModel, IOrderedMimeType, ITransformedDisplayOutputDto, mimeTypeSupportedByCore, notebookDocumentFilterMatch, NotebookEditorPriority, NOTEBOOK_DISPLAY_ORDER, sortMimeTypes } from 'vs/workbench/contrib/notebook/common/notebookCommon';
+import { ACCESSIBLE_NOTEBOOK_DISPLAY_ORDER, BUILTIN_RENDERER_ID, CellKind, CellOutputKind, DisplayOrderKey, IDisplayOutput, INotebookDecorationRenderOptions, INotebookKernelInfo2, INotebookKernelProvider, INotebookRendererInfo, INotebookTextModel, IOrderedMimeType, ITransformedDisplayOutputDto, mimeTypeSupportedByCore, notebookDocumentFilterMatch, NotebookEditorPriority, NOTEBOOK_DISPLAY_ORDER, RENDERER_NOT_AVAILABLE, sortMimeTypes } from 'vs/workbench/contrib/notebook/common/notebookCommon';
 import { NotebookOutputRendererInfo } from 'vs/workbench/contrib/notebook/common/notebookOutputRenderer';
 import { NotebookEditorDescriptor, NotebookProviderInfo } from 'vs/workbench/contrib/notebook/common/notebookProvider';
 import { IMainNotebookController, INotebookService } from 'vs/workbench/contrib/notebook/common/notebookService';
@@ -767,10 +767,17 @@ export class NotebookService extends Disposable implements INotebookService, ICu
 					});
 				}
 			} else {
-				orderMimeTypes.push({
-					mimeType: mimeType,
-					rendererId: BUILTIN_RENDERER_ID
-				});
+				if (mimeTypeSupportedByCore(mimeType)) {
+					orderMimeTypes.push({
+						mimeType: mimeType,
+						rendererId: BUILTIN_RENDERER_ID
+					});
+				} else {
+					orderMimeTypes.push({
+						mimeType: mimeType,
+						rendererId: RENDERER_NOT_AVAILABLE
+					});
+				}
 			}
 		});
 

src/vs/workbench/contrib/notebook/browser/view/renderers/codeCell.ts

@@ -23,7 +23,7 @@ import { EDITOR_BOTTOM_PADDING, EDITOR_TOP_PADDING } from 'vs/workbench/contrib/
 import { CellFocusMode, CodeCellRenderTemplate, INotebookEditor } from 'vs/workbench/contrib/notebook/browser/notebookBrowser';
 import { getResizesObserver } from 'vs/workbench/contrib/notebook/browser/view/renderers/sizeObserver';
 import { CodeCellViewModel } from 'vs/workbench/contrib/notebook/browser/viewModel/codeCellViewModel';
-import { BUILTIN_RENDERER_ID, CellOutputKind, CellUri, IInsetRenderOutput, IProcessedOutput, IRenderOutput, ITransformedDisplayOutputDto, outputHasDynamicHeight, RenderOutputType } from 'vs/workbench/contrib/notebook/common/notebookCommon';
+import { BUILTIN_RENDERER_ID, CellOutputKind, CellUri, IInsetRenderOutput, IProcessedOutput, IRenderOutput, ITransformedDisplayOutputDto, outputHasDynamicHeight, RENDERER_NOT_AVAILABLE, RenderOutputType } from 'vs/workbench/contrib/notebook/common/notebookCommon';
 import { INotebookService } from 'vs/workbench/contrib/notebook/common/notebookService';
 import { ITextFileService } from 'vs/workbench/services/textfile/common/textfiles';
 import { ClickTargetType } from 'vs/workbench/contrib/notebook/browser/view/renderers/cellWidgets';
@@ -67,7 +67,8 @@ class OutputElement extends Disposable {
 			const transformedDisplayOutput = this.output as ITransformedDisplayOutputDto;
 
 			const mimeTypes = this.notebookService.getMimeTypeInfo(this.notebookEditor.textModel!, this.output);
-			const pick = this.pickedMimeTypes.get(this.output) ?? 0;
+
+			const pick = this.pickedMimeTypes.get(this.output) ?? Math.max(mimeTypes.findIndex(mimeType => mimeType.rendererId !== RENDERER_NOT_AVAILABLE), 0);
 
 			if (mimeTypes.length > 1) {
 				outputItemDiv.style.position = 'relative';

src/vs/workbench/contrib/notebook/common/notebookCommon.ts

@@ -58,6 +58,7 @@ export const ACCESSIBLE_NOTEBOOK_DISPLAY_ORDER = [
 ];
 
 export const BUILTIN_RENDERER_ID = '_builtin';
+export const RENDERER_NOT_AVAILABLE = '_notAvailable';
 
 export enum NotebookRunState {
 	Running = 1,