Method isValidFirstLine

src/selection.h:40–40

    [[nodiscard]] inline qsizetype getLastPos() const { return lastPos; };

    [[nodiscard]] inline bool isValidFirstLine() const { return firstLine.isValid(); }
    inline void clearOldSelection() { oldLastLine.invalidate(), oldFirstLine.invalidate(); };

    [[nodiscard]] inline LineRef getOldLastLine() const { return oldLastLine; };