Fix auto indent with closed brace

A closed brace in auto-indent shouldn't affect the next brace in the same line,
but it behaves like below:

  p() {
    }

It's a bug.

Author: aycabta

lib/irb/ruby-lex.rb

@@ -394,6 +394,7 @@ def check_corresponding_token_depth
           spaces_of_nest.pop
           corresponding_token_depth = nil
         end
+        open_brace_on_line -= 1
       when :on_kw
         next if index > 0 and @tokens[index - 1][3].allbits?(Ripper::EXPR_FNAME)
         case t[2]

test/irb/test_ruby_lex.rb

@@ -112,5 +112,19 @@ def test_multiple_braces_in_a_line
         assert_indenting(lines, row.new_line_spaces, true)
       end
     end
+
+    def test_a_closed_brace_and_not_closed_brace_in_a_line
+      input_with_correct_indents = [
+        Row.new(%q(p() {), nil, 2),
+        Row.new(%q(}), 0, 0),
+      ]
+
+      lines = []
+      input_with_correct_indents.each do |row|
+        lines << row.content
+        assert_indenting(lines, row.current_line_spaces, false)
+        assert_indenting(lines, row.new_line_spaces, true)
+      end
+    end
   end
 end