src/vs/workbench/contrib/extensions/browser/extensionsActions.ts/InstallRemoteExtensionsInLocalAction/getExtensionsToInstall
class InstallRemoteExtensionsInLocalAction:	protected getExtensionsToInstall(local: IExtension[]): IExtension[] {
		return local.filter(extension =>
			extension.type === ExtensionType.User && extension.server !== this.extensionManagementServerService.localExtensionManagementServer
			&& !this.extensionsWorkbenchService.installed.some(e => e.server === this.extensionManagementServerService.localExtensionManagementServer && areSameExtensions(e.identifier, extension.identifier)));
	}