feat(#3113): add renderer.icons.folder_arrow_padding

doc/nvim-tree-lua.txt

@@ -463,6 +463,7 @@ Following is the default configuration. See |nvim-tree-opts| for details. >lua
           diagnostics_placement = "signcolumn",
           bookmarks_placement = "signcolumn",
           padding = " ",
+          folder_arrow_padding = " ",
           symlink_arrow = " ➛ ",
           show = {
             file = true,
@@ -1069,6 +1070,10 @@ Configuration options for icons.
     Inserted between icon and filename.
       Type: `string`, Default: `" "`
 
+    *nvim-tree.renderer.icons.folder_arrow_padding*
+    Inserted between folder arrow icon and file/folder icon.
+      Type: `string`, Default: `" "`
+
     *nvim-tree.renderer.icons.symlink_arrow*
     Used as a separator between symlinks' source and target.
       Type: `string`, Default: `" ➛ "`
@@ -3173,6 +3178,7 @@ highlight group is not, hard linking as follows: >
 |nvim-tree.renderer.icons|
 |nvim-tree.renderer.icons.bookmarks_placement|
 |nvim-tree.renderer.icons.diagnostics_placement|
+|nvim-tree.renderer.icons.folder_arrow_padding|
 |nvim-tree.renderer.icons.git_placement|
 |nvim-tree.renderer.icons.glyphs|
 |nvim-tree.renderer.icons.glyphs.default|

lua/nvim-tree.lua

@@ -335,6 +335,7 @@ local DEFAULT_OPTS = { -- BEGIN_DEFAULT_OPTS
       diagnostics_placement = "signcolumn",
       bookmarks_placement = "signcolumn",
       padding = " ",
+      folder_arrow_padding = " ",
       symlink_arrow = " ➛ ",
       show = {
         file = true,

lua/nvim-tree/renderer/components/padding.lua

@@ -95,15 +95,15 @@ function M.get_arrows(node)
   local dir = node:as(DirectoryNode)
   if dir then
     if dir.open then
-      str = M.config.icons.glyphs.folder["arrow_open"] .. " "
+      str = M.config.icons.glyphs.folder["arrow_open"] .. M.config.icons.folder_arrow_padding
       hl = "NvimTreeFolderArrowOpen"
     else
-      str = M.config.icons.glyphs.folder["arrow_closed"] .. " "
+      str = M.config.icons.glyphs.folder["arrow_closed"] .. M.config.icons.folder_arrow_padding
     end
   elseif M.config.indent_markers.enable then
     str = ""
   else
-    str = "  "
+    str = " " .. string.rep(" ", #M.config.icons.folder_arrow_padding)
   end
 
   return { str = str, hl = { hl } }