Show warning when pasteAs fails (#202300)

For #188736

Show an inline message when a requested pasteAs keybinding fails

Author: mjbvz

src/vs/editor/contrib/dropOrPasteInto/browser/copyPasteController.ts

@@ -33,6 +33,7 @@ import { IInstantiationService } from 'vs/platform/instantiation/common/instanti
 import { IProgressService, ProgressLocation } from 'vs/platform/progress/common/progress';
 import { IQuickInputService, IQuickPickItem } from 'vs/platform/quickinput/common/quickInput';
 import { PostEditWidgetManager } from './postEditWidget';
+import { MessageController } from 'vs/editor/contrib/message/browser/messageController';
 
 export const changePasteTypeCommandId = 'editor.changePasteType';
 
@@ -212,6 +213,7 @@ export class CopyPasteController extends Disposable implements IEditorContributi
 			return;
 		}
 
+		MessageController.get(this._editor)?.closeMessage();
 		this._currentPasteOperation?.cancel();
 		this._currentPasteOperation = undefined;
 
@@ -221,7 +223,10 @@ export class CopyPasteController extends Disposable implements IEditorContributi
 			return;
 		}
 
-		if (!this.isPasteAsEnabled()) {
+		if (
+			!this.isPasteAsEnabled()
+			&& !this._pasteAsActionContext // Still enable if paste as was explicitly requested
+		) {
 			return;
 		}
 
@@ -240,8 +245,19 @@ export class CopyPasteController extends Disposable implements IEditorContributi
 
 		const allProviders = this._languageFeaturesService.documentPasteEditProvider
 			.ordered(model)
-			.filter(provider => provider.pasteMimeTypes?.some(type => matchesMimeType(type, allPotentialMimeTypes)));
+			.filter(provider => {
+				if (this._pasteAsActionContext?.preferredId) {
+					if (this._pasteAsActionContext.preferredId !== provider.id) {
+						return false;
+					}
+				}
+
+				return provider.pasteMimeTypes?.some(type => matchesMimeType(type, allPotentialMimeTypes));
+			});
 		if (!allProviders.length) {
+			if (this._pasteAsActionContext?.preferredId) {
+				this.showPasteAsNoEditMessage(selections, this._pasteAsActionContext?.preferredId);
+			}
 			return;
 		}
 
@@ -258,6 +274,10 @@ export class CopyPasteController extends Disposable implements IEditorContributi
 		}
 	}
 
+	private showPasteAsNoEditMessage(selections: readonly Selection[], editId: string) {
+		MessageController.get(this._editor)?.showMessage(localize('pasteAsError', "No paste edits for '{0}' found", editId), selections[0].getStartPosition());
+	}
+
 	private doPasteInline(allProviders: readonly DocumentPasteEditProvider[], selections: readonly Selection[], dataTransfer: VSDataTransfer, metadata: CopyMetadata | undefined, context: DocumentPasteContext): void {
 		const p = createCancelablePromise(async (token) => {
 			const editor = this._editor;
@@ -339,6 +359,9 @@ export class CopyPasteController extends Disposable implements IEditorContributi
 				}
 
 				if (!providerEdits.length) {
+					if (context.only) {
+						this.showPasteAsNoEditMessage(selections, context.only);
+					}
 					return;
 				}