Are you allowed to review Torah that you already learnt before Tisha Bi'Av on Tisha Bi'Av?
Other prohibitions include...Learning Torah, since this is a joyful activity. It is permitted to learn texts relevant to Tisha B'Av and mourning -- e.g. the Book of Lamentations, Book of Job, parts of Tractate Moed Katan, Gittin 56-58, Sanhedrin 104, Yerushalmi end of Ta'anis, and the Laws of Mourning. In-depth study should be avoided. (MB 554:4)
So does this rule of not learning Torah on Tisha Bi'Av only apply to NEW Torah you learn on Tisha Bi'Av, and does not apply to just reviewing Torah.
So my question is: does this rule (of not learning Torah on Tisha Bi'Av) apply to both learning new Torah and reviewing Torah or just learning new Torah?
(I was thinking that maybe it does not apply to reviewing because you do not get as happy for just reviewing Torah)