refactor(window)!: greatly simplify the code

This change removes the extra logic for the window border. I'm not sure
why it was there in the first place, but as far as I could see, neovim
is able to support the border without any extra logic.

lua/yazi/window.lua

@@ -2,7 +2,6 @@ local M = {}
 
 ---@class YaziFloatingWindow
 ---@field win integer floating_window_id
----@field border_window integer
 ---@field content_buffer integer
 ---@field config YaziConfig
 local YaziFloatingWindow = {}
@@ -30,10 +29,6 @@ function YaziFloatingWindow:close()
   if vim.api.nvim_win_is_valid(self.win) then
     vim.api.nvim_win_close(self.win, true)
   end
-
-  if vim.api.nvim_win_is_valid(self.border_window) then
-    vim.api.nvim_win_close(self.border_window, true)
-  end
 end
 
 function YaziFloatingWindow:open_and_display()
@@ -46,44 +41,17 @@ function YaziFloatingWindow:open_and_display()
   local row = math.ceil(vim.o.lines - height) / 2
   local col = math.ceil(vim.o.columns - width) / 2
 
-  local border_opts = {
-    style = 'minimal',
-    relative = 'editor',
-    row = row - 1,
-    col = col - 1,
-    width = width + 2,
-    height = height + 2,
-  }
-
+  ---@type vim.api.keyset.win_config
   local opts = {
     style = 'minimal',
     relative = 'editor',
     row = row,
     col = col,
     width = width,
     height = height,
+    border = 'rounded',
   }
 
-  local topleft, top, topright, right, botright, bot, botleft, left =
-    '╭', '─', '╮', '│', '╯', '─', '╰', '│'
-
-  local border_lines = { topleft .. string.rep(top, width) .. topright }
-  local middle_line = left .. string.rep(' ', width) .. right
-  for _ = 1, height do
-    table.insert(border_lines, middle_line)
-  end
-  table.insert(border_lines, botleft .. string.rep(bot, width) .. botright)
-
-  -- create a unlisted scratch buffer for the border
-  local border_buffer = vim.api.nvim_create_buf(false, true)
-
-  -- set border_lines in the border buffer from start 0 to end -1 and strict_indexing false
-  vim.api.nvim_buf_set_lines(border_buffer, 0, -1, true, border_lines)
-  -- create border window
-  local border_window = vim.api.nvim_open_win(border_buffer, true, border_opts)
-  vim.api.nvim_set_hl(0, 'YaziBorder', { link = 'Normal', default = true })
-  vim.cmd('set winhl=NormalFloat:YaziBorder')
-
   local yazi_buffer = vim.api.nvim_create_buf(false, true)
   -- create file window, enter the window, and use the options defined in opts
   local win = vim.api.nvim_open_win(yazi_buffer, true, opts)
@@ -104,79 +72,9 @@ function YaziFloatingWindow:open_and_display()
   })
 
   self.win = win
-  self.border_window = border_window
   self.content_buffer = yazi_buffer
 
   return self
 end
 
---- open a floating window with nice borders
----@param config YaziConfig
----@return integer, integer, integer
-function M.open_floating_window(config)
-  local height = math.ceil(vim.o.lines * config.floating_window_scaling_factor)
-    - 1
-  local width = math.ceil(vim.o.columns * config.floating_window_scaling_factor)
-
-  local row = math.ceil(vim.o.lines - height) / 2
-  local col = math.ceil(vim.o.columns - width) / 2
-
-  local border_opts = {
-    style = 'minimal',
-    relative = 'editor',
-    row = row - 1,
-    col = col - 1,
-    width = width + 2,
-    height = height + 2,
-  }
-
-  local opts = {
-    style = 'minimal',
-    relative = 'editor',
-    row = row,
-    col = col,
-    width = width,
-    height = height,
-  }
-
-  local topleft, top, topright, right, botright, bot, botleft, left =
-    '╭', '─', '╮', '│', '╯', '─', '╰', '│'
-
-  local border_lines = { topleft .. string.rep(top, width) .. topright }
-  local middle_line = left .. string.rep(' ', width) .. right
-  for _ = 1, height do
-    table.insert(border_lines, middle_line)
-  end
-  table.insert(border_lines, botleft .. string.rep(bot, width) .. botright)
-
-  -- create a unlisted scratch buffer for the border
-  local border_buffer = vim.api.nvim_create_buf(false, true)
-
-  -- set border_lines in the border buffer from start 0 to end -1 and strict_indexing false
-  vim.api.nvim_buf_set_lines(border_buffer, 0, -1, true, border_lines)
-  -- create border window
-  local border_window = vim.api.nvim_open_win(border_buffer, true, border_opts)
-  vim.api.nvim_set_hl(0, 'YaziBorder', { link = 'Normal', default = true })
-  vim.cmd('set winhl=NormalFloat:YaziBorder')
-
-  local yazi_buffer = vim.api.nvim_create_buf(false, true)
-  -- create file window, enter the window, and use the options defined in opts
-  local win = vim.api.nvim_open_win(yazi_buffer, true, opts)
-
-  vim.bo[yazi_buffer].filetype = 'yazi'
-
-  vim.cmd('setlocal bufhidden=hide')
-  vim.cmd('setlocal nocursorcolumn')
-  vim.api.nvim_set_hl(0, 'YaziFloat', { link = 'Normal', default = true })
-  vim.cmd('setlocal winhl=NormalFloat:YaziFloat')
-  vim.cmd('set winblend=' .. config.yazi_floating_window_winblend)
-
-  -- use autocommand to ensure that the border_buffer closes at the same time as the main buffer
-  vim.cmd("autocmd WinLeave <buffer> silent! execute 'hide'")
-  local cmd = [[autocmd WinLeave <buffer> silent! execute 'silent bdelete! %s']]
-  vim.cmd(cmd:format(border_buffer))
-
-  return win, border_window, yazi_buffer
-end
-
 return M