newdb: Fix reloading of content server on metadata.db change

src/calibre/db/__init__.py

@@ -137,7 +137,7 @@ def get_db_loader():
 
 '''
 Various things that require other things before they can be migrated:
-    1. Check that content server reloading on metadata,db change, metadata
+    1. Check that metadata
     backup, refresh gui on calibredb add and moving libraries all work (check
     them on windows as well for file locking issues)
 '''

src/calibre/db/legacy.py

@@ -120,6 +120,7 @@ class LibraryDatabase(object):
         if self.last_modified() > self.last_update_check:
             self.backend.reopen()
             self.new_api.reload_from_db()
+            self.data.refresh(clear_caches=False)  # caches are already cleared by reload_from_db()
         self.last_update_check = utcnow()
 
     @property

src/calibre/db/view.py

@@ -322,10 +322,11 @@ class View(object):
         # be shared by multiple views. This is not ideal, but...
         self.cache.clear_search_caches(old_marked_ids | set(self.marked_ids))
 
-    def refresh(self, field=None, ascending=True):
+    def refresh(self, field=None, ascending=True, clear_caches=True):
         self._map = tuple(self.cache.all_book_ids())
         self._map_filtered = tuple(self._map)
-        self.cache.clear_caches()
+        if clear_caches:
+            self.cache.clear_caches()
         if field is not None:
             self.sort(field, ascending)
         if self.search_restriction or self.base_restriction: