Fix sorting problem in manage categories. Fix poor performance problem when dropping multiple books onto a user category. Remove 'empty field' error dialogs in bulk search/replace, instead setting the fields to their default value.

src/calibre/gui2/dialogs/metadata_bulk.py

@@ -749,15 +749,9 @@ class MetadataBulkDialog(ResizableDialog, Ui_MetadataBulkDialog):
         val = self.s_r_do_regexp(mi)
         val = self.s_r_do_destination(mi, val)
         if dfm['is_multiple']:
-            if dest == 'authors' and len(val) == 0:
-                error_dialog(self, _('Search/replace invalid'),
-                             _('Authors cannot be set to the empty string. '
-                               'Book title %s not processed')%mi.title,
-                             show=True)
-                return
-            # convert the colon-separated pair strings back into a dict, which
-            # is what set_identifiers wants
             if dfm['is_csp']:
+                # convert the colon-separated pair strings back into a dict,
+                # which is what set_identifiers wants
                 dst_id_type = unicode(self.s_r_dst_ident.text())
                 if dst_id_type:
                     v = ''.join(val)
@@ -769,11 +763,7 @@ class MetadataBulkDialog(ResizableDialog, Ui_MetadataBulkDialog):
         else:
             val = self.s_r_replace_mode_separator().join(val)
             if dest == 'title' and len(val) == 0:
-                error_dialog(self, _('Search/replace invalid'),
-                             _('Title cannot be set to the empty string. '
-                               'Book title %s not processed')%mi.title,
-                             show=True)
-                return
+                val = _('Unknown')
 
         if dfm['is_custom']:
             extra = self.db.get_custom_extra(id, label=dfm['label'], index_is_id=True)

src/calibre/gui2/dialogs/tag_categories.py

@@ -260,6 +260,7 @@ class TagCategories(QDialog, Ui_TagCategories):
             self.applied_items = [cat[2] for cat in self.categories.get(self.current_cat_name, [])]
         else:
             self.applied_items = []
+        self.applied_items.sort(key=lambda x:sort_key(self.all_items[x].name))
         self.display_filtered_categories(None)
 
     def accept(self):

src/calibre/gui2/tag_browser/model.py

@@ -685,42 +685,35 @@ class TagsModel(QAbstractItemModel): # {{{
 
     def handle_user_category_drop(self, on_node, ids, column):
         categories = self.db.prefs.get('user_categories', {})
-        category = categories.get(on_node.category_key[1:], None)
-        if category is None:
+        cat_contents = categories.get(on_node.category_key[1:], None)
+        if cat_contents is None:
             return
+        cat_contents = set([(v, c) for v,c,ign in cat_contents])
+
         fm_src = self.db.metadata_for_field(column)
-        for id in ids:
         label = fm_src['label']
+
+        for id in ids:
             if not fm_src['is_custom']:
                 if label == 'authors':
-                    items = self.db.get_authors_with_ids()
-                    items = [(i[0], i[1].replace('|', ',')) for i in items]
                     value = self.db.authors(id, index_is_id=True)
                     value = [v.replace('|', ',') for v in value.split(',')]
                 elif label == 'publisher':
-                    items = self.db.get_publishers_with_ids()
                     value = self.db.publisher(id, index_is_id=True)
                 elif label == 'series':
-                    items = self.db.get_series_with_ids()
                     value = self.db.series(id, index_is_id=True)
             else:
-                items = self.db.get_custom_items_with_ids(label=label)
                 if fm_src['datatype'] != 'composite':
                     value = self.db.get_custom(id, label=label, index_is_id=True)
                 else:
                     value = self.db.get_property(id, loc=fm_src['rec_index'],
                                                  index_is_id=True)
-            if value is None:
-                return
+            if value:
                 if not isinstance(value, list):
                     value = [value]
-            for val in value:
-                for (v, c, id) in category:
-                    if v == val and c == column:
-                        break
-                else:
-                    category.append([val, column, 0])
-            categories[on_node.category_key[1:]] = category
+                cat_contents |= set([(v, column) for v in value])
+
+        categories[on_node.category_key[1:]] = [[v, c, 0] for v,c in cat_contents]
         self.db.prefs.set('user_categories', categories)
         self.refresh_required.emit()