gnucash stable: xaccAccountDeleteAllTransactions: Avoid UAF crashes

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/90662d72 (commit)
	from  https://github.com/Gnucash/gnucash/commit/0e15e12e (commit)



commit 90662d72a2857cbc1300bc8c5f8a526cd296b784
Author: John Ralls <jralls at ceridwen.us>
Date:   Fri Mar 7 15:42:17 2025 -0800

    xaccAccountDeleteAllTransactions: Avoid UAF crashes
    
    Chris Lam pointed out that the original algo would crash if a
    transaction had more than one split in the account being deleted.
    Deduplicate the transaction vector first to protect against that.
    
    Also suspend qof events for a 4x speedup.



Summary of changes:
 libgnucash/engine/Account.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)