feat(#2349): add "right_align" option for renderer.icons.*_placement (#2846)

* feat(icon_placement): Allow right_align icon_placemente for decorator using ext_marks nvim api

* feat(icon_placement): Allow right_align icon_placemente for decorator using ext_marks nvim api

feat(icon_placement): Allow right_align icon_placemente for decorator using ext_marks nvim api

* feat(icon_placement): consolidate doc

* fix: extra namespace added to avoid colision between right_align and full_name features

* style: rename namespace_id

---------

Co-authored-by: Alexander Courtis <alex@courtis.org>

lua/nvim-tree/renderer/builder.lua

@@ -61,6 +61,7 @@ function Builder:new()
     lines = {},
     markers = {},
     signs = {},
+    extmarks = {},
   }
   setmetatable(o, self)
   self.__index = self
@@ -229,6 +230,14 @@ function Builder:format_line(indent_markers, arrows, icon, name, node)
     add_to_end(line, M.decorators[i]:icons_after(node))
   end
 
+  local rights = {}
+  for i = #M.decorators, 1, -1 do
+    add_to_end(rights, M.decorators[i]:icons_right_align(node))
+  end
+  if #rights > 0 then
+    self.extmarks[self.index] = rights
+  end
+
   return line
 end