Do not add newlines when annotating rendered views

actionview/lib/action_view/template.rb

@@ -333,10 +333,8 @@ def #{method_name}(local_assigns, output_buffer)
           raise WrongEncodingError.new(source, Encoding.default_internal)
         end
 
-        start_line = @handler.respond_to?(:start_line) ? @handler.start_line(self) : 0
-
         begin
-          mod.module_eval(source, identifier, start_line)
+          mod.module_eval(source, identifier, 0)
         rescue SyntaxError
           # Account for when code in the template is not syntactically valid; e.g. if we're using
           # ERB and the user writes <%= foo( %>, attempting to call a helper `foo` and interpolate

actionview/lib/action_view/template/handlers/erb.rb

@@ -40,15 +40,6 @@ def handles_encoding?
           true
         end
 
-        # Line number to pass to #module_eval
-        #
-        # If we're annotating the template, we need to offset the starting
-        # line number passed to #module_eval so that errors in the template
-        # will be raised on the correct line.
-        def start_line(template)
-          annotate?(template) ? -1 : 0
-        end
-
         def call(template, source)
           # First, convert to BINARY, so in case the encoding is
           # wrong, we can still find an encoding tag
@@ -69,19 +60,15 @@ def call(template, source)
             trim: (self.class.erb_trim_mode == "-")
           }
 
-          if annotate?(template)
-            options[:preamble] = "@output_buffer.safe_append='<!-- BEGIN #{template.short_identifier} -->\n';"
-            options[:postamble] = "@output_buffer.safe_append='<!-- END #{template.short_identifier} -->\n';@output_buffer.to_s"
+          if ActionView::Base.annotate_rendered_view_with_filenames && template.format == :html
+            options[:preamble] = "@output_buffer.safe_append='<!-- BEGIN #{template.short_identifier} -->';"
+            options[:postamble] = "@output_buffer.safe_append='<!-- END #{template.short_identifier} -->';@output_buffer.to_s"
           end
 
           self.class.erb_implementation.new(erb, options).src
         end
 
       private
-        def annotate?(template)
-          ActionView::Base.annotate_rendered_view_with_filenames && template.format == :html
-        end
-
         def valid_encoding(string, encoding)
           # If a magic encoding comment was found, tag the
           # String with this encoding. This is for a case

actionview/test/actionpack/controller/render_test.rb

@@ -217,7 +217,7 @@ def render_xml_hello_as_string_template
   end
 
   def render_line_offset
-    render inline: "<% raise %>", locals: { foo: "bar" }
+    render template: "test/raise"
   end
 
   def heading
@@ -1459,15 +1459,10 @@ def test_template_annotations
 
     get :greeting
 
-    lines = @response.body.split("\n")
-
-    assert_includes lines.first, "<!-- BEGIN"
-    assert_includes lines.first, "test/fixtures/actionpack/test/greeting.html.erb -->"
-
-    assert_includes lines[1], "This is grand!"
-
-    assert_includes lines.last, "<!-- END"
-    assert_includes lines.last, "test/fixtures/actionpack/test/greeting.html.erb -->"
+    assert_includes @response.body, "<!-- BEGIN"
+    assert_includes @response.body, "<!-- END"
+    assert_includes @response.body, "test/fixtures/actionpack/test/greeting.html.erb"
+    assert_includes @response.body, "This is grand!"
   ensure
     ActionView::Base.annotate_rendered_view_with_filenames = false
   end

actionview/test/fixtures/actionpack/test/raise.html.erb

@@ -0,0 +1 @@
+<% raise %>