From edfd15c36f9c050512ebdfab3553cd3a7f6ff06f Mon Sep 17 00:00:00 2001
From: Josh Matthews <josh@joshmatthews.net>
Date: Thu, 7 Mar 2019 18:58:53 -0500
Subject: Ensure iframe's contentWindow is updated when traversing the session
 history.

---
 components/script/script_thread.rs | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

(limited to 'components/script/script_thread.rs')

diff --git a/components/script/script_thread.rs b/components/script/script_thread.rs
index 4076a56f9ca..448acd23790 100644
--- a/components/script/script_thread.rs
+++ b/components/script/script_thread.rs
@@ -1429,7 +1429,7 @@ impl ScriptThread {
                     NotifyVisibilityChange(id, ..) => Some(id),
                     Navigate(id, ..) => Some(id),
                     PostMessage { target: id, .. } => Some(id),
-                    UpdatePipelineId(_, _, id, _) => Some(id),
+                    UpdatePipelineId(_, _, _, id, _) => Some(id),
                     UpdateHistoryState(id, ..) => Some(id),
                     RemoveHistoryStates(id, ..) => Some(id),
                     FocusIFrame(id, ..) => Some(id),
@@ -1617,11 +1617,13 @@ impl ScriptThread {
             ConstellationControlMsg::UpdatePipelineId(
                 parent_pipeline_id,
                 browsing_context_id,
+                top_level_browsing_context_id,
                 new_pipeline_id,
                 reason,
             ) => self.handle_update_pipeline_id(
                 parent_pipeline_id,
                 browsing_context_id,
+                top_level_browsing_context_id,
                 new_pipeline_id,
                 reason,
             ),
@@ -2153,6 +2155,7 @@ impl ScriptThread {
         &self,
         parent_pipeline_id: PipelineId,
         browsing_context_id: BrowsingContextId,
+        top_level_browsing_context_id: TopLevelBrowsingContextId,
         new_pipeline_id: PipelineId,
         reason: UpdatePipelineIdReason,
     ) {
@@ -2163,6 +2166,21 @@ impl ScriptThread {
         if let Some(frame_element) = frame_element {
             frame_element.update_pipeline_id(new_pipeline_id, reason);
         }
+
+        if let Some(window) = self.documents.borrow().find_window(new_pipeline_id) {
+            // Ensure that the state of any local window proxies accurately reflects
+            // the new pipeline.
+            let _ = self.local_window_proxy(
+                &*window,
+                browsing_context_id,
+                top_level_browsing_context_id,
+                Some(parent_pipeline_id),
+                // Any local window proxy has already been created, so there
+                // is no need to pass along existing opener information that
+                // will be discarded.
+                None,
+            );
+        }
     }
 
     fn handle_update_history_state_msg(
@@ -2870,6 +2888,7 @@ impl ScriptThread {
             self.handle_update_pipeline_id(
                 parent_pipeline,
                 window_proxy.browsing_context_id(),
+                window_proxy.top_level_browsing_context_id(),
                 incomplete.pipeline_id,
                 UpdatePipelineIdReason::Navigation,
             );
-- 
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