Floating windows decoration highlighting problem

[fragov]

Some floating windows (probably those, who use NormalFloat highlight) have black borders on black background:

You may see same problem on your screenshot, where you have used TSHighlightCapturesUnderCursor

[cocopon]

Do you know what the border is? I mainly use Vim and don't know much about it.

[fragov]

Window on screenshot is created by https://github.com/stevearc/dressing.nvim plugin.
It has winhighlight option in config. I did found in source code of it next message: Set winhighlight="NormalFloat:MyHighlightGroup" instead, so I believe it is "NormalFloat".
They use this component for window: https://github.com/MunifTanjim/nui.nvim/tree/main/lua/nui/input
It has such code in config:

win_options = {
    winhighlight = "Normal:Normal",
  },

[cocopon]

NormalFloat is for background of the floating window. According to my research, FloatBorder is appropriate for this case.

I'll add color definitions around it, please wait...

[hori-ryota]

any updates? 🙇

[lambdalisue]

This is a workaround, but we can link FloatNormal and FloatBorder to Normal and Delimiter as follows:

" NOTE: This must be defined PRIOR to setting the colorscheme.
if has('nvim')
  function! s:fix_iceberg_border() abort
    highlight link FloatNormal Normal
    highlight link FloatBorder Delimiter
  endfunction
  augroup my_iceberg_fix
    autocmd!
    autocmd ColorScheme iceberg call s:fix_iceberg_border()
  augroup END
endif

The above configuration makes the floating window appear as follows: