QMLJS: Fix exception handling in promises

If an exception is thrown inside a promise's resolve or reject
handler, the promise needs to resolve into a rejected state with the
exceptions value. The value was previously not set.

Fixes: QTBUG-78554
Change-Id: Ic22faa6ef1e519e4cae6732c69bb14f7053d13da
Reviewed-by: Ulf Hermann <[email protected]>
Reviewed-by: Qt CI Bot <[email protected]>

1 files changed, 1 insertions, 0 deletions

diff --git a/src/qml/jsruntime/qv4promiseobject.cpp b/src/qml/jsruntime/qv4promiseobject.cpp
index 40a0dfaa57..851fee7bd8 100644
--- a/src/qml/jsruntime/qv4promiseobject.cpp
+++ b/src/qml/jsruntime/qv4promiseobject.cpp
@@ -163,6 +163,7 @@ void ReactionHandler::executeReaction(ReactionEvent *event)
         ScopedFunctionObject reaction(scope);
         if (scope.hasException()) {
             reaction = capability->d()->reject.as<QV4::FunctionObject>();
+            result = scope.engine->catchException();
         } else {
             reaction = capability->d()->resolve.as<QV4::FunctionObject>();
         }