What causes the madd in هَا of لَتَرَوُنَّهَا?

Al-ʿAṣr and At-Takāthur: Applied Ghunnah, Madd, Lām and Waqf

• Extra ṣilah yāʾ of hāʾ kināyah
• Iqlāb of nūn sākinah
• An actual madd alif after hāʾ
• Mīm idghām