Added fix for incorrect CSS indent after closing bracket

Added a failing test for possible broken CSS syntax tree

tests/indent/css_spec.lua

@@ -0,0 +1,28 @@
+local Runner = require("tests.indent.common").Runner
+local XFAIL = require("tests.indent.common").XFAIL
+
+local run = Runner:new(it, "tests/indent/css", {
+  tabstop = 2,
+  shiftwidth = 2,
+  softtabstop = 0,
+  expandtab = true,
+})
+
+describe("indent CSS:", function()
+  describe("whole file:", function()
+    run:whole_file(".", {
+      expected_failures = {},
+    })
+  end)
+
+  describe("new line:", function()
+    run:new_line("closing.css", { on_line = 1, text = "}", indent = 0 })
+    run:new_line(
+      "block.css",
+      { on_line = 1, text = "color: green;", indent = 2 },
+      "might fail because tree is in a broken state",
+      XFAIL
+    )
+    run:new_line("next_rule.css", { on_line = 3, text = ".next {", indent = 0 })
+  end)
+end)