LibJS+LibWeb: Clear exceptions after call'ing JavaScript functions

Decorated Interpreter::call() with [[nodiscard]] to provoke thinking
about the returned value at each call site. This is definitely not
perfect and we should really start thinking about slimming down the
public-facing LibJS interpreter API.

Fixes #3136.

1 files changed, 4 insertions, 1 deletions

diff --git a/Libraries/LibWeb/DOM/Node.cpp b/Libraries/LibWeb/DOM/Node.cpp
index b6a51ddfe2..0b8cc49b4d 100644
--- a/Libraries/LibWeb/DOM/Node.cpp
+++ b/Libraries/LibWeb/DOM/Node.cpp
@@ -127,7 +127,10 @@ void Node::dispatch_event(NonnullRefPtr<Event> event)
             auto* event_wrapper = wrap(global_object, *event);
             JS::MarkedValueList arguments(global_object.heap());
             arguments.append(event_wrapper);
-            document().interpreter().call(function, this_value, move(arguments));
+            auto& interpreter = document().interpreter();
+            (void)interpreter.call(function, this_value, move(arguments));
+            if (interpreter.exception())
+                interpreter.clear_exception();
         }
     }