Fix optionalReplacementSpan not being applied to completion entries #200945
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This will fix the problem with the first video shown at vuejs/language-tools#3789 (comment).
If TS CompletionEntry has no replacementSpan, VSCode will fallback to the wordPattern of the language configuration, but for Vue documents, VSCode will not use the wordPattern of the embedded language, but the wordPattern of the vue language, so the
$xxxvariable will not be replaced correctly.