fix: backport built-in extension detection fix

Author: Loïc Mangeonjean

vscode-patches/0083-fix-backport-configuration-editing-built-in-extensio.patch

@@ -0,0 +1,61 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Lo=C3=AFc=20Mangeonjean?= <[email protected]>
+Date: Wed, 22 Oct 2025 18:02:13 +0200
+Subject: [PATCH] fix: backport configuration-editing built-in extension
+ detection fix
+
+https://github.com/microsoft/vscode/pull/272730
+---
+ extensions/configuration-editing/src/extensionsProposals.ts | 2 +-
+ src/vs/workbench/api/common/extHostExtensionService.ts      | 2 ++
+ src/vscode-dts/vscode.d.ts                                  | 5 +++++
+ 3 files changed, 8 insertions(+), 1 deletion(-)
+
+diff --git a/extensions/configuration-editing/src/extensionsProposals.ts b/extensions/configuration-editing/src/extensionsProposals.ts
+index ba1c33e7845..bafc4ef36a0 100644
+--- a/extensions/configuration-editing/src/extensionsProposals.ts
++++ b/extensions/configuration-editing/src/extensionsProposals.ts
+@@ -8,7 +8,7 @@ import * as vscode from 'vscode';
+ 
+ export async function provideInstalledExtensionProposals(existing: string[], additionalText: string, range: vscode.Range, includeBuiltinExtensions: boolean): Promise<vscode.CompletionItem[] | vscode.CompletionList> {
+ 	if (Array.isArray(existing)) {
+-		const extensions = includeBuiltinExtensions ? vscode.extensions.all : vscode.extensions.all.filter(e => !(e.id.startsWith('vscode.') || e.id === 'Microsoft.vscode-markdown'));
++		const extensions = includeBuiltinExtensions ? vscode.extensions.all : vscode.extensions.all.filter(e => !(e.isBuiltin || e.id === 'Microsoft.vscode-markdown'));
+ 		const knownExtensionProposals = extensions.filter(e => existing.indexOf(e.id) === -1);
+ 		if (knownExtensionProposals.length) {
+ 			return knownExtensionProposals.map(e => {
+diff --git a/src/vs/workbench/api/common/extHostExtensionService.ts b/src/vs/workbench/api/common/extHostExtensionService.ts
+index 61b03cc7ae9..2fc7b0d1922 100644
+--- a/src/vs/workbench/api/common/extHostExtensionService.ts
++++ b/src/vs/workbench/api/common/extHostExtensionService.ts
+@@ -1177,12 +1177,14 @@ export class Extension<T extends object | null | undefined> implements vscode.Ex
+ 	readonly packageJSON: IExtensionDescription;
+ 	readonly extensionKind: vscode.ExtensionKind;
+ 	readonly isFromDifferentExtensionHost: boolean;
++	readonly isBuiltin: boolean;
+ 
+ 	constructor(extensionService: IExtHostExtensionService, originExtensionId: ExtensionIdentifier, description: IExtensionDescription, kind: ExtensionKind, isFromDifferentExtensionHost: boolean) {
+ 		this.#extensionService = extensionService;
+ 		this.#originExtensionId = originExtensionId;
+ 		this.#identifier = description.identifier;
+ 		this.id = description.identifier.value;
++		this.isBuiltin = description.isBuiltin;
+ 		this.extensionUri = description.extensionLocation;
+ 		this.extensionPath = path.normalize(originalFSPath(description.extensionLocation));
+ 		this.packageJSON = description;
+diff --git a/src/vscode-dts/vscode.d.ts b/src/vscode-dts/vscode.d.ts
+index 7bb1c69f7f9..d457207627d 100644
+--- a/src/vscode-dts/vscode.d.ts
++++ b/src/vscode-dts/vscode.d.ts
+@@ -8311,6 +8311,11 @@ declare module 'vscode' {
+ 		 */
+ 		extensionKind: ExtensionKind;
+ 
++		/**
++		 * `true` if the extension is a built-in extension.
++		 */
++		isBuiltin: boolean;
++
+ 		/**
+ 		 * The public API exported by this extension (return value of `activate`).
+ 		 * It is an invalid action to access this field before this extension has been activated.