Is there an exemption from the general restrictions of Tisha B'Av for acts necessary to honor Shabbat?

Synopsis

When Tisha B'Av falls on Shabbat or its eve, certain acts of mourning are suspended or modified to preserve the dignity of Shabbat, but learning restrictions remain.

Early Acharonim
Late Acharonim
Lenient
Strict
Lesser cited
Major authority

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