Don’t call page_values twice when it’s not needed

Fix #1013.
Kozea · Dec 21, 2019 · 3f74dd9 · 3f74dd9
1 parent eca2a6b
commit 3f74dd9
Showing 1 changed file with 8 additions and 3 deletions.
diff --git a/weasyprint/formatting_structure/boxes.py b/weasyprint/formatting_structure/boxes.py
@@ -371,9 +371,14 @@ def get_wrapped_table(self):
     def page_values(self):
         start_value, end_value = super(ParentBox, self).page_values()
         if self.children:
-            start_box, end_box = self.children[0], self.children[-1]
-            start_value = start_box.page_values()[0] or start_value
-            end_value = end_box.page_values()[1] or end_value
+            if len(self.children) == 1:
+                page_values = self.children[0].page_values()
+                start_value = page_values[0] or start_value
+                end_value = page_values[1] or end_value
+            else:
+                start_box, end_box = self.children[0], self.children[-1]
+                start_value = start_box.page_values()[0] or start_value
+                end_value = end_box.page_values()[1] or end_value
         return start_value, end_value