Merge rust-bitcoin/rust-miniscript#307: Make Tr::spend_info public

4c0b64ad47319ac26b558c9f89da4c003e3558b4 Make Tr::spend_info public (Dr Maxim Orlovsky)

Pull request description:

  This is needed for wallet libraries downstream to access for instance merkle root of the script.

Top commit has no ACKs.

Tree-SHA512: 56d33855e4d8a0847359bd5b004d1895bda4e58ab054bd2a9eb5025bd9c023234834dc51c0d9ab74879c6225e366faa6fc3c7ce0dfde198a193a4ac7fd15916b

Author: heap-coder

src/descriptor/tr.rs

@@ -211,10 +211,12 @@ impl<Pk: MiniscriptKey> Tr<Pk> {
         }
     }
 
-    // Compute the [`TaprootSpendInfo`] associated with this descriptor if spend data is [None]
-    // If spend data is already computed (i.e it is not None), this does not recompute it
-    // TaprootSpendInfo is only required for spending via the script paths.
-    fn spend_info(&self) -> Arc<TaprootSpendInfo>
+    /// Compute the [`TaprootSpendInfo`] associated with this descriptor if spend data is `None`.
+    ///
+    /// If spend data is already computed (i.e it is not `None`), this does not recompute it.
+    ///
+    /// [`TaprootSpendInfo`] is only required for spending via the script paths.
+    pub fn spend_info(&self) -> Arc<TaprootSpendInfo>
     where
         Pk: ToPublicKey,
     {