Sync IRB master: tool/sync_default_gems.rb irb

It looks like tool/sync_default_gems.rb is not capable of cherry-picking
commits from ruby/irb. I just executed `tool/sync_default_gems.rb irb`
to fix the sync status.

I'm not sure if what's the cause. It could be related to some diff that
doesn't exist in ruby/ruby, or it might be related to non-linear history
due to merge commits. For next time, I'd like to at least exclude the
second possibility, so I disabled merge commits in ruby/irb.

test/irb/test_cmd.rb

@@ -376,50 +376,6 @@ module TestIRB
       assert_match(/Please specify the file name./, out)
     end
 
-    def test_help
-      IRB.init_config(nil)
-      input = TestInputMethod.new([
-          "help 'String#gsub'\n",
-          "\n",
-        ])
-      IRB.conf[:PROMPT_MODE] = :SIMPLE
-      IRB.conf[:VERBOSE] = false
-      irb = IRB::Irb.new(IRB::WorkSpace.new(self), input)
-      out, err = capture_output do
-        irb.eval_input
-      end
-
-      # the former is what we'd get without document content installed, like on CI
-      # the latter is what we may get locally
-      possible_rdoc_output = [/Nothing known about String#gsub/, /Returns a copy of self with all occurrences of the given pattern/]
-      assert(possible_rdoc_output.any? { |output| output.match?(out) }, "Expect the help command to match one of the possible outputs")
-    ensure
-      # this is the only way to reset the redefined method without coupling the test with its implementation
-      load "irb/cmd/help.rb"
-    end
-
-    def test_help_without_rdoc
-      IRB.init_config(nil)
-      input = TestInputMethod.new([
-          "help 'String#gsub'\n",
-          "\n",
-        ])
-      IRB.conf[:PROMPT_MODE] = :SIMPLE
-      IRB.conf[:VERBOSE] = false
-      irb = IRB::Irb.new(IRB::WorkSpace.new(self), input)
-      out, err = capture_output do
-        without_rdoc do
-          irb.eval_input
-        end
-      end
-
-      # if it fails to require rdoc, it only returns the command object
-      assert_match(/=> IRB::ExtendCommand::Help\n/, out)
-    ensure
-      # this is the only way to reset the redefined method without coupling the test with its implementation
-      load "irb/cmd/help.rb"
-    end
-
     def test_irb_load
       File.write("#{@tmpdir}/a.rb", "a = 'hi'\n")
       out, err = execute_lines(

test/irb/test_ruby_lex.rb

@@ -706,6 +706,69 @@ module TestIRB
       end
     end
 
+    def test_corresponding_token_depth_with_heredoc_and_embdoc
+      reference_code = <<~EOC.chomp
+        if true
+          hello
+          p(
+          )
+      EOC
+      code_with_heredoc = <<~EOC.chomp
+        if true
+          <<~A
+          A
+          p(
+          )
+      EOC
+      code_with_embdoc = <<~EOC.chomp
+        if true
+        =begin
+        =end
+          p(
+          )
+      EOC
+      [reference_code, code_with_heredoc, code_with_embdoc].each do |code|
+        lex = RubyLex.new
+        lines = code.lines
+        lex.instance_variable_set('@tokens', RubyLex.ripper_lex_without_warning(code))
+        assert_equal 2, lex.check_corresponding_token_depth(lines, lines.size)
+      end
+    end
+
+    def test_find_prev_spaces_with_multiline_literal
+      lex = RubyLex.new
+      reference_code = <<~EOC.chomp
+        if true
+          1
+          hello
+          1
+          world
+        end
+      EOC
+      code_with_percent_string = <<~EOC.chomp
+        if true
+          %w[
+            hello
+          ]
+          world
+        end
+      EOC
+      code_with_quoted_string = <<~EOC.chomp
+        if true
+          '
+            hello
+          '
+          world
+        end
+      EOC
+      [reference_code, code_with_percent_string, code_with_quoted_string].each do |code|
+        lex = RubyLex.new
+        lex.instance_variable_set('@tokens', RubyLex.ripper_lex_without_warning(code))
+        prev_spaces = (1..code.lines.size).map { |index| lex.find_prev_spaces index }
+        assert_equal [0, 2, 2, 2, 2, 0], prev_spaces
+      end
+    end
+
     private
 
     def build_context(local_variables = nil)