2781 retain initial-leading and final-trailing space when reformatting

[pbwolf]

What has changed?

Note - I may have misinterpreted #2781. It looks odd to me, that reformatting the top level corrects the indentation (to 0) of all top-level forms except the first one.

• Retain initial leading & final trailing space when reformatting - not only in format-on-type, but also in on-demand reformatting, and even when cljfmt option ":remove-trailing-whitespace?" is true.
• Initialize the model's documentVersion, so reformatting can be done immediately upon opening the document.
• In "bandaging & healing", avoid double-counting the same whitespace as both leading and trailing, when the document is all blank.

Fixes #2781

My Calva PR Checklist

I have:

• Read How to Contribute.
• Directed this pull request at the dev branch. (Or have specific reasons to target some other branch.)
• Made sure I have changed the PR base branch, so that it is not published. (Sorry for the nagging.)
• Made sure there is an issue registered with a clear problem statement that this PR addresses, (created the issue if it was not present).
  • Updated the [Unreleased] entry in CHANGELOG.md, linking the issue(s) that the PR is addressing.
• Figured if anything about the fix warrants tests on Mac/Linux/Windows/Remote/Whatever, and either tested it there if so, or mentioned it in the PR.
• Added to or updated docs in this branch, if appropriate
• Tests
  • Tested the particular change
  • Figured if the change might have some side effects and tested those as well.
• Formatted all JavaScript and TypeScript code that was changed. (use the prettier extension or run npm run prettier-format)
• Confirmed that there are no linter warnings or errors (use the eslint extension, run npm run eslint before creating your PR, or run npm run eslint-watch to eslint as you go).

Ping @PEZ, @bpringe, @corasaurus-hex, @Cyrik

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[PEZ]

Thanks! ❤️