fix(highlight): explicitly define `TabLineSel` bg/fg #41196

Problem: `TabLineSel` by default is defined with only bold attribute.
  This makes selected tabpage stand out relatively well, but when used
  in custom tabline it will be combined with `TabLineFill` (which is
  reserved for the "non tabpage" part of the tabline).
  Plus the behavior is not consistent with the default 'tabline' which
  combines it with `Normal`.

Solution: Explicitly define background and foreground colors to come
  from `Normal` to ensure the current default 'tabline' behavior even in
  custom tabline.
  The more semantically driven solution here is to link `TabLineSel` to
  `StatusLine`. This makes it more aligned with how `TabLine` is linked
  to `StatusLineNC`. But the current "bold text with `Normal` colors" is
  argued to look better as a default.

  Also make sure that 'notermguicolors' highlighting in default and
  custom tablines is the same: the current tabpage does not have
  underline and is not bold.

0 files changed, 0 insertions, 0 deletions