Fixing a shortcut to detect alive children without iterating

Dependencies

• [2] GHO6DWPI Refactoring iterators
• [3] SXEYMYF7 Fixing the bad changes in history (unfortunately, by rebooting).
• [*] 6YMDOZIB Refactoring apply
• [*] CCLLB7OI Upgrading to Sanakirja 0.15 + version bump

Change contents

• replacement in libpijul/src/apply.rs at line 739
  [2.66408]→[2.66408:66503](∅→∅)
  − if !e.flag.contains(EdgeFlags::PSEUDO) || is_alive(txn, channel, p).unwrap() {
  [2.66408]

  [2.66503]
  + if e.flag.contains(EdgeFlags::BLOCK)

  + || p.is_empty()

  + || is_alive(txn, channel, p).unwrap()

  + {
• edit in libpijul/src/apply.rs at line 788
  [5.20720]

  [6.132150]
  + debug_assert!(is_alive(txn, channel, c).unwrap());