Drop style data from descendants on display:none.

MozReview-Commit-ID: 8ls43oAGWRg

1 files changed, 9 insertions, 0 deletions

diff --git a/components/script/dom/node.rs b/components/script/dom/node.rs
index ec2c45bfe8c..767a3132eb3 100644
--- a/components/script/dom/node.rs
+++ b/components/script/dom/node.rs
@@ -952,6 +952,7 @@ pub trait LayoutNodeHelpers {
 
     unsafe fn get_style_and_layout_data(&self) -> Option<OpaqueStyleAndLayoutData>;
     unsafe fn init_style_and_layout_data(&self, OpaqueStyleAndLayoutData);
+    unsafe fn take_style_and_layout_data(&self) -> OpaqueStyleAndLayoutData;
 
     fn text_content(&self) -> String;
     fn selection(&self) -> Option<Range<usize>>;
@@ -1051,6 +1052,14 @@ impl LayoutNodeHelpers for LayoutJS<Node> {
         (*self.unsafe_get()).style_and_layout_data.set(Some(val));
     }
 
+    #[inline]
+    #[allow(unsafe_code)]
+    unsafe fn take_style_and_layout_data(&self) -> OpaqueStyleAndLayoutData {
+        let val = (*self.unsafe_get()).style_and_layout_data.get().unwrap();
+        (*self.unsafe_get()).style_and_layout_data.set(None);
+        val
+    }
+
     #[allow(unsafe_code)]
     fn text_content(&self) -> String {
         if let Some(text) = self.downcast::<Text>() {