Blame information is invalid when a file has changed outside of VSCode

[SailorMax]

GitLens ignore new/deleted line shifts in modified by outside file.

Steps:

1. open document which history has few people, for example:
   line 1 by user A
   line 2 by user B
   line 3 by user C
2. open same document in another editor (EditPlus?)
3. EditPlus: put cursor in end of line 1, press Enter and save changes
4. switch to VSCode
5. check owners of lines 1-4

Expected:
line 1 by user A
line 2 (empty) has no user
line 3 by user B
line 4 by user C

Actual:
line 1 by user A
line 2 (empty) by user B
line 3 by user C
line 4 has no user

P.S. GitLens start to see new line only after resave file in VSCode. Looks like it ignore "refresh document" event.

[SailorMax]

this is continue of bug #36

[eamodio]

Thanks! I'll take a look

[github-actions]

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