fix(git): git folder fixes and improvements (#1809)

* coding style

* outlined git.show_on_open_dirs behavior

* show some icon on opendir even if show_on_open_dir=false

and show all children's status on parent

* fixed renamed icon not showing

* sorted icons

* removed DU from deleted as file will show up in tree

* fixed update_git_status in reloaders not tested

* fixed Api.git.reload()

Tested update_git_status in reloaders.lua

* sort icon only if not git signcolumn

* fixed crashing when root dir isn't git dir

* made git.show_on_dirs doc more concise

* git_statuses -> git_status for consistency

* explorer/common.lua -> explorer/node.lua

* fixed #1784 conflict

* don't order icons

* Revert "don't order icons"

This reverts commit 23f6276ef7.

lua/nvim-tree/actions/moves/item.lua

@@ -2,7 +2,7 @@ local utils = require "nvim-tree.utils"
 local view = require "nvim-tree.view"
 local core = require "nvim-tree.core"
 local lib = require "nvim-tree.lib"
-local explorer_common = require "nvim-tree.explorer.common"
+local explorer_node = require "nvim-tree.explorer.node"
 
 local M = {}
 
@@ -15,7 +15,7 @@ function M.fn(where, what)
     for line, node in pairs(nodes_by_line) do
       local valid = false
       if what == "git" then
-        valid = explorer_common.shows_git_status(node)
+        valid = explorer_node.get_git_status(node) ~= nil
       elseif what == "diag" then
         valid = node.diag_status ~= nil
       end