lsp: Send DidOpen notifications when changing selections in multi buffer (#22958)

Fixes #22773

Release Notes:

- Fixed an edge case with multibuffers that could break language
features within them.
b6b06cf6d8Piotr Osiewicz committed on 2/7/2025, 11:33:35 AM· committed by GitHubparentf700268
5 files changedLine totals unavailable