Key bindings are not consistent across all providers

[luisdavim]

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Environment (please complete the following information):

• OS: macOS
• (Neo)Vim version: NVIM v0.7.2
• vim-clap version: latest
• Have you reproduced with a minimal vimrc: yes
• Have you updated to the latest plugin version: yes
• Have you upgraded to/compiled the latest Rust binary: yes

Describe the bug

With some providers I can use Ctrl + v; Ctrl + x; Ctrl + t to open a split or tab, but this doesn't work for all providers.
For example, it works with files but not filler, it works with grep2 but not with coc_outline or coc_diagnostics or when using Clap with coc-references...

[liuchengxu]

Thanks for the question, this's unfortunately expected behavior for now, for clap currently only provides a default implementation for the providers whose item is file-like and the provider needs to state it explicitly (https://github.com/liuchengxu/vim-clap/blob/8e47e5b8ab/autoload/clap/provider/grep2.vim), which is not extensible.

I can imagine it can be improved in such a way that defining generic key binding traits each provider can implement on its own. However, still, not all the providers can support Ctrl-c/x/t at the end of the day as not all items make sense to be opened in a split or tab.