old_contents: def linebreak_iter(template_source):
      yield 0
      p = template_source.find('\n')
      while p >= 0:
          yield p + 1
          p = template_source.find('\n', p + 1)
      yield len(template_source) + 1
  
  
  def get_data_from_template(source):
      origin, (start, end) = source
      template_source = origin.reload()
  
      lineno = None
      upto = 0
      source_lines = []
      for num, next in enumerate(linebreak_iter(template_source)):
          if start >= upto and end <= next:
              lineno = num
          source_lines.append(template_source[upto:next])
          upto = next
  
      if not source_lines or lineno is None:
          return {}
  
      pre_context = source_lines[max(lineno - 3, 0):lineno]
      post_context = source_lines[(lineno + 1):(lineno + 4)]
      context_line = source_lines[lineno]
  
      return {
          'sentry.interfaces.Template': {
              'filename': origin.name,
              'pre_context': pre_context,
              'context_line': context_line,
              'lineno': lineno,
              'post_context': post_context,
          },
          'culprit': origin.loadname,
      }
  
new_contents: def linebreak_iter(template_source):
      yield 0
      p = template_source.find('\n')
      while p >= 0:
          yield p + 1
          p = template_source.find('\n', p + 1)
      yield len(template_source) + 1
  
  
  def get_data_from_template(source):
      origin, (start, end) = source
      template_source = origin.reload()
  
      lineno = None
      upto = 0
      source_lines = []
      for num, next in enumerate(linebreak_iter(template_source)):
          if start >= upto and end <= next:
              lineno = num
          source_lines.append(template_source[upto:next])
          upto = next
  
      if not source_lines or lineno is None:
          return {}
  
      pre_context = source_lines[max(lineno - 3, 0):lineno]
      post_context = source_lines[(lineno + 1):(lineno + 4)]
      context_line = source_lines[lineno]
  
      return {
          'sentry.interfaces.Template': {
              'filename': origin.loadname,
              'abs_path': origin.name,
              'pre_context': pre_context,
              'context_line': context_line,
              'lineno': lineno,
              'post_context': post_context,
          },
          'culprit': origin.loadname,
      }
  
subject: Implement relative path (use loadname) for Templates