There are still some “mysteries”:
3:
Open Batch in “Find in Files”.
Close the dialog.
Open Find.
Open Batch in Find.
Close the dialog.
Open Find again.
Close Batch in Find.
Close the dialog.
Open “Find in Files”.
** Its Batch is closed.
4:
Open Batch in Find/Replace.
Press keyboard shortcut for Replace/Find.
** Its Batch is closed.
(Also occurs in “Find/Replace in Files”.)