Bug 1404789 - Stop reconstructing frames for the whole shadow root each time content is inserted in a shadow tree

* Cleanup a bit the ShadowRoot code
* Privatize ShadowRoot methods
* When the shadow tree distribution changes, post a restyle + reframe
* Simplify ShadowRoot::IsPooledNode
* Be a bit better at detecting distribution changes

Tag #1375

1 files changed, 2 insertions, 4 deletions

diff --git a/dom/html/HTMLContentElement.cpp b/dom/html/HTMLContentElement.cpp
index 158f8d0ce..15d79c761 100644
--- a/dom/html/HTMLContentElement.cpp
+++ b/dom/html/HTMLContentElement.cpp
@@ -248,8 +248,7 @@ HTMLContentElement::AfterSetAttr(int32_t aNamespaceID, nsIAtom* aName,
         }
       }
 
-      ShadowRoot* containingShadow = GetContainingShadow();
-      if (containingShadow) {
+      if (ShadowRoot* containingShadow = GetContainingShadow()) {
         containingShadow->DistributeAllNodes();
       }
     } else {
@@ -258,8 +257,7 @@ HTMLContentElement::AfterSetAttr(int32_t aNamespaceID, nsIAtom* aName,
       mValidSelector = true;
       mSelectorList = nullptr;
 
-      ShadowRoot* containingShadow = GetContainingShadow();
-      if (containingShadow) {
+      if (ShadowRoot* containingShadow = GetContainingShadow()) {
         containingShadow->DistributeAllNodes();
       }
     }