src/vs/workbench/api/browser/mainThreadSCM.ts/MainThreadSCM/$setInputBoxPlaceholder
class MainThreadSCM:	$setInputBoxPlaceholder(sourceControlHandle: number, placeholder: string): void {
		const repository = this._repositories.get(sourceControlHandle);

		if (!repository) {
			return;
		}

		repository.input.placeholder = placeholder;
	}