drain micro task queue before reset ExecutionWorld and page

Author: krichprollsch

src/browser/js/ExecutionWorld.zig

@@ -231,6 +231,12 @@ pub fn createContext(self: *ExecutionWorld, page: *Page, enter: bool, global_cal
 }
 
 pub fn removeContext(self: *ExecutionWorld) void {
+    // Force running the micro task to drain the queue before reseting the
+    // context arena.
+    // Tasks in the queue are relying to the arena memory could be present in
+    // the queue. Running them later could lead to invalid memory accesses.
+    self.env.runMicrotasks();
+
     self.context.?.deinit();
     self.context = null;
     _ = self.context_arena.reset(.{ .retain_with_limit = CONTEXT_ARENA_RETAIN });

src/browser/page.zig

@@ -161,6 +161,9 @@ pub const Page = struct {
     }
 
     fn reset(self: *Page) void {
+        // Force running the micro task to drain the queue.
+        self.session.browser.env.runMicrotasks();
+
         self.scheduler.reset();
         self.http_client.abort();
         self.script_manager.reset();