[vim/vim] runtime(vim): Fix heredoc triggering misidentifcation of Vim9 script (PR #20654)

[dkearns]

The following let-heredoc can cause legacy scripts to be misidentified as Vim9 script if it appears early in the file. Only match :vim9script at the start of a line where it sensibly belongs.

let x =<< trim LINES
  vim9script
  ...
LINES

Fixes #20647 (reported by Maxim Kim).

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You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/20654

Commit Summary

• 12be575 runtime(vim): Fix heredoc triggering misidentifcation of Vim9 script

File Changes

(3 files)

• M runtime/ftplugin/vim.vim (2)
• M runtime/syntax/generator/vim.vim.base (4)
• M runtime/syntax/vim.vim (4)

Patch Links:

• https://github.com/vim/vim/pull/20654.patch
• https://github.com/vim/vim/pull/20654.diff

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