test/doc: remove misleading comment and improve tests

remove misleading comment for m_blocks_unlinked since for
pruned nodes:
- usually A is the missing data (just like in non-pruned nodes)
- in PruneOneBlockFile, we remove entries once data for B is missing.

Co-authored-by: Martin Zumsande <mzumsande@gmail.com>

src/node/blockstorage.h

@@ -352,7 +352,6 @@ public:
 
     /**
      * All pairs A->B, where A (or one of its ancestors) misses transactions, but B has transactions.
-     * Pruned nodes may have entries where B is missing data.
      */
     std::multimap<CBlockIndex*, CBlockIndex*> m_blocks_unlinked;
 

test/functional/feature_pruning.py

@@ -6,7 +6,6 @@
 
 WARNING:
 This test uses 4GB of disk space.
-This test takes 30 mins or more (up to 2 hours)
 """
 import os
 
@@ -351,17 +350,15 @@ class PruneTest(BitcoinTestFramework):
         self.log.info("Stop and start pruning node to trigger wallet rescan")
         self.restart_node(2, extra_args=["-prune=550"])
 
-        wallet_info = self.nodes[2].getwalletinfo()
-        self.wait_until(lambda: wallet_info["scanning"] == False)
-        self.wait_until(lambda: wallet_info["lastprocessedblock"]["height"] == self.nodes[2].getblockcount())
+        self.wait_until(lambda: self.nodes[2].getwalletinfo()["scanning"] == False)
+        self.wait_until(lambda: self.nodes[2].getwalletinfo()["lastprocessedblock"]["height"] == self.nodes[2].getblockcount())
 
         # check that wallet loads successfully when restarting a pruned node after IBD.
         # this was reported to fail in #7494.
         self.restart_node(5, extra_args=["-prune=550", "-blockfilterindex=1"]) # restart to trigger rescan
 
-        wallet_info = self.nodes[5].getwalletinfo()
-        self.wait_until(lambda: wallet_info["scanning"] == False)
-        self.wait_until(lambda: wallet_info["lastprocessedblock"]["height"] == self.nodes[0].getblockcount())
+        self.wait_until(lambda: self.nodes[5].getwalletinfo()["scanning"] == False)
+        self.wait_until(lambda: self.nodes[5].getwalletinfo()["lastprocessedblock"]["height"] == self.nodes[0].getblockcount())
 
     def run_test(self):
         self.log.info("Warning! This test requires 4GB of disk space")