feat(window): allow customizing the border

Neovim ships with many options for the border. Expose all the options
through yazi.

I think this should also support coloring and other highlight group
features, as well as customizing the border in a lot of detail, but I
have not tested these myself. At least the basic border type options
worked in my tests.

README.md

@@ -113,6 +113,11 @@ You can optionally configure yazi.nvim by setting any of the options below.
       -- when yazi opened multiple files. The default is to send them to the
       -- quickfix list, but if you want to change that, you can define it here
       yazi_opened_multiple_files = function(chosen_files, config) end,
+
+      -- the type of border to use for the floating window. Can be many values,
+      -- including 'none', 'rounded', 'single', 'double', 'shadow', etc. For
+      -- more information, see :h nvim_open_win
+      yazi_floating_window_border = 'rounded',
     },
   },
 }

lua/yazi/config.lua

@@ -18,6 +18,7 @@ function M.default()
 
     floating_window_scaling_factor = 0.9,
     yazi_floating_window_winblend = 0,
+    yazi_floating_window_border = 'rounded',
   }
 end
 

lua/yazi/types.lua

@@ -7,6 +7,7 @@
 ---@field public hooks? YaziConfigHooks
 ---@field public floating_window_scaling_factor? float "the scaling factor for the floating window. 1 means 100%, 0.9 means 90%, etc."
 ---@field public yazi_floating_window_winblend? float "the transparency of the yazi floating window (0-100). See :h winblend"
+---@field public yazi_floating_window_border? any "the type of border to use. See nvim_open_win() for the values your neovim version supports"
 
 ---@class YaziConfigHooks
 ---@field public yazi_opened fun(preselected_path: string | nil, buffer: integer, config: YaziConfig):nil

lua/yazi/window.lua

@@ -49,7 +49,7 @@ function YaziFloatingWindow:open_and_display()
     col = col,
     width = width,
     height = height,
-    border = 'rounded',
+    border = self.config.yazi_floating_window_border,
   }
 
   local yazi_buffer = vim.api.nvim_create_buf(false, true)