refactor(renderer): refactor git handling

Concat and apply git highlight inside the builder.
This allows to not leak private data from builder to the git component.
This will also now allow us to customize git icon placement.

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

@@ -65,9 +65,6 @@ local function build_icons_table()
   }
 end
 
-local function empty()
-  return ""
-end
 local function nil_() end
 
 local function warn_status(git_status)
@@ -78,28 +75,21 @@ local function warn_status(git_status)
   )
 end
 
-local function get_icons_(node, line, depth, icon_len, hl)
+local function get_icons_(node)
   local git_status = node.git_status
   if not git_status then
-    return ""
+    return nil
   end
 
-  local icon = ""
   local icons = M.git_icons[git_status]
   if not icons then
     if vim.g.nvim_tree_git_hl ~= 1 then
       warn_status(git_status)
     end
-    return ""
-  end
-  for _, v in ipairs(icons) do
-    if #v.icon > 0 then
-      table.insert(hl, { v.hl, line, depth + icon_len + #icon, depth + icon_len + #icon + #v.icon })
-      icon = icon .. v.icon .. M.icon_padding
-    end
+    return nil
   end
 
-  return icon
+  return icons
 end
 
 local git_hl = {
@@ -143,26 +133,20 @@ local function get_highlight_(node)
   return git_hl[git_status]
 end
 
-function M.get_icons()
-  return empty()
-end
+M.get_icons = nil_
+M.get_highlight = nil_
 
-function M.get_highlight()
-  return nil_()
-end
-
-M.icon_padding = vim.g.nvim_tree_icon_padding or " "
 M.icon_state = _icons.get_config()
 M.git_icons = build_icons_table()
 
 function M.reload()
   M.icon_state = _icons.get_config()
-  M.icon_padding = vim.g.nvim_tree_icon_padding or " "
   M.git_icons = build_icons_table()
+
   if M.icon_state.show_git_icon then
     M.get_icons = get_icons_
   else
-    M.get_icons = empty
+    M.get_icons = nil_
   end
   if vim.g.nvim_tree_git_hl == 1 then
     M.get_highlight = get_highlight_