Bug: Custom snippets with $ aren't expanded properly with repeater

[rzhao271]

Steps

1. Define the HTML snippet "test": "(div>div.aaa{$}+div.bbb{$})"
2. Expand test*2

Expected result

<div>
	<div class="aaa">1</div>
	<div class="bbb">1</div>
</div>
<div>
	<div class="aaa">2</div>
	<div class="bbb">2</div>
</div>

This is the same as (div>div.aaa{$}+div.bbb{$})*2

Actual result

<div>
	<div class="aaa">1</div>
	<div class="bbb">1</div>
</div>
<div>
	<div class="aaa">1</div>
	<div class="bbb">1</div>
</div>

Downstream issue microsoft/vscode#65904