present: retain complete caption command when parsing captions
present: retain complete caption command when parsing captions

Updates golang/go#41883

Change-Id: I332aa821a6e414a77ff8d8cc384ba23b5955b05b
Reviewed-on: https://go-review.googlesource.com/c/tools/+/260897
Run-TryBot: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
gopls-CI: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
TryBot-Result: Go Bot <66cb808b70d30c07676d5e946fee83fd561249e5@golang.org>
Reviewed-by: Ian Lance Taylor <87e9c6d529889242b7e184afb632328636553ab4@golang.org>
Trust: Cherry Zhang <d62e63aa42ce272d7b6a5055d97e942b33a34679@google.com>

golang/tools,golang/tools,golang/tools,golang/tools,golang/tools