Auto merge of #24789 - gterzian:fix_unloading, r=jdm

Fix unloading, active BC, and clearing js runtime

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Do not set the window to be the currently active one for the windowproxy as part of `load`, as it will be done later when the document activity is set. And doing it later means that when unload runs, it is with the unloaded pipeline as the active window.

Only nullify the window proxy if it's not used by another (currently-active) window.

---
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- [ ] `./mach build -d` does not report any errors
- [ ] `./mach test-tidy` does not report any errors
- [ ] These changes fix #24591 (GitHub issue number if applicable)

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- [ ] There are tests for these changes OR
- [ ] These changes do not require tests because ___

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1 files changed, 2 insertions, 1 deletions

diff --git a/components/script/script_thread.rs b/components/script/script_thread.rs
index 81784d73a6c..a9ebd9eb46c 100644
--- a/components/script/script_thread.rs
+++ b/components/script/script_thread.rs
@@ -3125,7 +3125,8 @@ impl ScriptThread {
         opener: Option<BrowsingContextId>,
     ) -> DomRoot<WindowProxy> {
         if let Some(window_proxy) = self.window_proxies.borrow().get(&browsing_context_id) {
-            window_proxy.set_currently_active(&*window);
+            // Note: we do not set the window to be the currently-active one,
+            // this will be done instead when the script-thread handles the `SetDocumentActivity` msg.
             return DomRoot::from_ref(window_proxy);
         }
         let iframe = parent_info.and_then(|parent_id| {