@Nullable
      private static IndentType findIndentType(String @NotNull [] lines, int indent) {
        IndentType indentType = null;
        for (int i = 0; i < lines.length; i++) {
          String line = lines[i];
          if (!isContentPart(lines, i, line)) continue;
          for (int j = 0; j < indent; j++) {
            char c = line.charAt(j);
            IndentType currentType = IndentType.of(c);
            if (currentType == null) return null;
            if (indentType == null) {
              indentType = currentType;
            }
            else if (indentType != currentType) {
              return null;
            }
          }
        }
        return indentType;
      }
@Nullable
      private static IndentType findIndentType(String @NotNull [] lines, int indent)