feat(filesystem): improve default empty folder icons (#1101)

Author: cseickel

lua/neo-tree/defaults.lua

@@ -198,8 +198,8 @@ local config = {
     icon = {
       folder_closed = "",
       folder_open = "",
-      folder_empty = "󰜌",
-      folder_empty_open = "󰜌",
+      folder_empty = "󰉖",
+      folder_empty_open = "󰷏",
       -- The next two settings are only a fallback, if you use nvim-web-devicons and configure default icons there
       -- then these will never be used.
       default = "*",

tests/neo-tree/ui/icons_spec.lua

@@ -71,15 +71,15 @@ describe("ui/icons", function()
 
       u.assert_buf_lines(bufnr, {
         string.format("  %s", fs_tree.abspath):sub(1, 42),
-        "   󰜌 baz",
+        "   󰉖 baz",
         "    foo",
         "   │  bar",
         "   └ * foo1.lua",
         "   * 1.md",
       })
 
       u.assert_highlight(bufnr, ns_id, 1, " ", "NeoTreeDirectoryIcon")
-      u.assert_highlight(bufnr, ns_id, 2, "󰜌 ", "NeoTreeDirectoryIcon")
+      u.assert_highlight(bufnr, ns_id, 2, "󰉖 ", "NeoTreeDirectoryIcon")
       u.assert_highlight(bufnr, ns_id, 4, " ", "NeoTreeDirectoryIcon")
       u.assert_highlight(bufnr, ns_id, 5, "* ", "NeoTreeFileIcon")
     end)
@@ -108,15 +108,15 @@ describe("ui/icons", function()
 
       u.assert_buf_lines(bufnr, {
         vim.fn.strcharpart(string.format("  %s", fs_tree.abspath), 0, 40),
-        "   󰜌 baz",
+        "   󰉖 baz",
         "    foo",
         "   │  bar",
         "   └  foo1.lua",
         "    1.md",
       })
 
       u.assert_highlight(bufnr, ns_id, 1, " ", "NeoTreeDirectoryIcon")
-      u.assert_highlight(bufnr, ns_id, 2, "󰜌 ", "NeoTreeDirectoryIcon")
+      u.assert_highlight(bufnr, ns_id, 2, "󰉖 ", "NeoTreeDirectoryIcon")
       u.assert_highlight(bufnr, ns_id, 4, " ", "NeoTreeDirectoryIcon")
 
       local extmarks = u.get_text_extmarks(bufnr, ns_id, 5, " ")