Fix bulk edit of bool columns when the tristate tweak is set to no

src/calibre/gui2/custom_column_widgets.py

@@ -429,7 +429,38 @@ class BulkBase(Base):
             self.db.set_custom_bulk(book_ids, val, num=self.col_id, notify=notify)
 
 class BulkBool(BulkBase, Bool):
-    pass
+
+    def get_initial_value(self, book_ids):
+        value = None
+        for book_id in book_ids:
+            val = self.db.get_custom(book_id, num=self.col_id, index_is_id=True)
+            if tweaks['bool_custom_columns_are_tristate'] == 'no' and val is None:
+                val = False
+            if value is not None and value != val:
+                return None
+            value = val
+        return value
+
+    def setup_ui(self, parent):
+        self.widgets = [QLabel('&'+self.col_metadata['name']+':', parent),
+                QComboBox(parent)]
+        w = self.widgets[1]
+        items = [_('Yes'), _('No'), _('Undefined')]
+        icons = [I('ok.png'), I('list_remove.png'), I('blank.png')]
+        for icon, text in zip(icons, items):
+            w.addItem(QIcon(icon), text)
+
+    def setter(self, val):
+        val = {None: 2, False: 1, True: 0}[val]
+        self.widgets[1].setCurrentIndex(val)
+
+    def commit(self, book_ids, notify=False):
+        val = self.gui_val
+        val = self.normalize_ui_val(val)
+        if val != self.initial_val:
+            if tweaks['bool_custom_columns_are_tristate'] == 'no' and val is None:
+                val = False
+            self.db.set_custom_bulk(book_ids, val, num=self.col_id, notify=notify)
 
 class BulkInt(BulkBase, Int):
     pass