Use the cache dir for temp files created by auto-add

Idiotic windows temp file cleaners.

src/calibre/gui2/auto_add.py

@@ -14,11 +14,11 @@ from future_builtins import map
 from PyQt5.Qt import (QFileSystemWatcher, QObject, Qt, pyqtSignal, QTimer, QApplication, QCursor)
 
 from calibre import prints
-from calibre.ptempfile import PersistentTemporaryDirectory
 from calibre.db.adding import filter_filename, compile_rule
 from calibre.ebooks import BOOK_EXTENSIONS
 from calibre.gui2 import gprefs
 from calibre.gui2.dialogs.duplicates import DuplicatesQuestion
+from calibre.utils.tdir_in_cache import tdir_in_cache
 
 AUTO_ADDED = frozenset(BOOK_EXTENSIONS) - {'pdr', 'mbp', 'tan'}
 
@@ -69,17 +69,20 @@ class Worker(Thread):
         return allowed
 
     def run(self):
-        self.tdir = PersistentTemporaryDirectory('_auto_adder')
-        while self.keep_running:
-            self.wake_up.wait()
-            self.wake_up.clear()
-            if not self.keep_running:
-                break
-            try:
-                self.auto_add()
-            except:
-                import traceback
-                traceback.print_exc()
+        self.tdir = tdir_in_cache('aa')
+        try:
+            while self.keep_running:
+                self.wake_up.wait()
+                self.wake_up.clear()
+                if not self.keep_running:
+                    break
+                try:
+                    self.auto_add()
+                except:
+                    import traceback
+                    traceback.print_exc()
+        finally:
+            shutil.rmtree(self.tdir, ignore_errors=True)
 
     def auto_add(self):
         from calibre.utils.ipc.simple_worker import fork_job, WorkerError