gc Comments C++ incorrectly about neovim

[clason]

Is the file C++? What does :set filetype? say?

[spacey-sooty]

It echos filetype=cpp

[clason]

...which also has /*%s*/ as the commentstring, so this is working as intended. If you want that changed, open an issue (or a PR) at vim/vim.

(Or install a commenting plugin; block comments are intentionally not implemented.)

[zeertzjq]

This is working as documented:

3. Commenting							*commenting*

Nvim supports commenting and uncommenting of lines based on 'commentstring'.

Acting on a single line behaves as follows:
- If the line matches 'commentstring', the comment markers are removed (e.g.
  `/*foo*/` is transformed to `foo`).
- Otherwise the comment markers are added to the current line (e.g. `foo` is
  transformed to `/*foo*/`). Blank lines are ignored.

Acting on multiple lines behaves as follows:
- If each affected non-blank line matches 'commentstring', then all comment
  markers are removed.
- Otherwise all affected lines are converted to comments; blank lines are
  transformed to empty comments (e.g. `/**/`). Comment markers are aligned to
  the least indented line.