Fix dstr handling.

Author: ioquatix

lib/rubocop/socketry/layout/consistent_blank_line_indentation.rb

@@ -52,7 +52,7 @@ def on_new_investigation
 
 					processed_source.lines.each_with_index do |line, index|
 						line_number = index + 1
-						
+
 						unless delta = indentation_deltas[line_number]
 							# Skip this line (e.g., non-squiggly heredoc content):
 							next
@@ -104,7 +104,7 @@ def walk_ast_for_indentation(node, deltas)
 						end
 					when :dstr
 						if location = node.location
-							if body = location.heredoc_body
+							if location.is_a?(Parser::Source::Map::Heredoc) and body = location.heredoc_body
 								if location.expression.source.start_with?("<<~")
 									# Squiggly heredoc - indentation is significant, add deltas
 									deltas[body.line] += 1

test/rubocop/socketry/layout/consistent_blank_line_indentation.rb

@@ -421,4 +421,15 @@
 			expect(offenses).to be(:empty?)
 		end
 	end
+
+	with "an interpolated string" do
+		let(:source) {"def foo\n\tname = 'world'\n\tputs \"Hello \#{name}\"\n\t\n\tputs 'done'\nend\n"}
+		it "does not interfere with blank line indentation for interpolated strings" do
+			processed_source = RuboCop::ProcessedSource.new(source, RUBY_VERSION.to_f)
+			investigator = RuboCop::Cop::Commissioner.new([cop], [], raise_error: true)
+			report = investigator.investigate(processed_source)
+			offenses = report.offenses
+			expect(offenses).to be(:empty?)
+		end
+	end
 end