static @NotNull Int2IntMap countBackSlashes(CharSequence text, int start, int end) {
    Int2IntMap result=new Int2IntOpenHashMap();
    int line = 0;
    if (end > text.length()) {
      end = text.length();
    }
    for (int i = start; i < end; i++) {
      char c = text.charAt(i);
      switch (c) {
        case '\n' -> line++;
        case '\\' -> result.put(line, 1);
      }
    }
    return result;
  }
static @NotNull Int2IntMap countBackSlashes(CharSequence text, int start, int end)