feature request: exclude `*` filetype from formatting with `fallback`

[gegoune]

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Describe the feature

lsp_format set to fallback (recommended setting) together with * configured means that no LSP formatting will ever be used.

It can be worked around by specifically overriding lsp_format, for example like so:

    dockerfile = { lsp_format = 'last' },

This has to be repeated for every filetype that has corresponding LSP with formatting capability configured.

I would like an option, or perhaps another value for lsp_format that would cause formatters configured by * to be excluded from fallback behaviour, removing the need for aforementioned workaround.

Provide background

I consider * filetype (catch-all) formatters to be 'cherry on top` rather than fundamental formatters filetypes should be associated with. I personally use:

    ['*'] = { 'squeeze_blanks', 'trim_newlines', 'trim_whitespace' },

and it means 'workaround` is required to have LSP formatting.

(I know there is _ key, but I still want those three formatters to work with every single filetype as not all formatters perform those actions.)

What is the significance of this feature?

nice to have

Additional details

What do you think about it? Or am I doing something wrong in the first place?

[lasse16]

I have a question in a similar direction.

Does the _ file-type also block fallback to the LSP?

My use-case is that I want to run trim-whitespace on any file that is not formatted in any other way.
But other way can also mean, that it is already formatted by an LSP.