src/vs/workbench/contrib/extensions/browser/extensionsWorkbenchService.ts/Extensions/onUninstallExtension
class Extensions:	private onUninstallExtension(identifier: IExtensionIdentifier): void {
		const extension = this.installed.filter(e => areSameExtensions(e.identifier, identifier))[0];
		if (extension) {
			const uninstalling = this.uninstalling.filter(e => areSameExtensions(e.identifier, identifier))[0] || extension;
			this.uninstalling = [uninstalling, ...this.uninstalling.filter(e => !areSameExtensions(e.identifier, identifier))];
			this._onChange.fire(uninstalling ? { extension: uninstalling } : undefined);
		}
	}