hover_worksheet focus if called twice.

[antosha417]

I did a little wrapper so if hover_worksheet is called twice than it will focus floating window (like regular hover behaviour). As I often find myself wanting either to scroll this floating window or to copy something from it.

local function hover_worksheet()
  local existing_float = vim.F.npcall(vim.api.nvim_buf_get_var, 0, 'lsp_floating_preview')
  if existing_float and vim.api.nvim_win_is_valid(existing_float) then
    vim.cmd('call win_gotoid(b:lsp_floating_preview)')
    return
  end
  require"metals".hover_worksheet { border = 'rounded' }
end

map('n', '<leader>hw', hover_worksheet)