Respect capacity in QVector::append().

Fix a bug in QVector::append(), it should use the capacity for new size,
when it is implicit shared and capacity is bigger than the new size.

Autotest included.

Task-number: QTBUG-11763
Reviewed-by: joao
Reviewed-by: Olivier Goffart

1 files changed, 3 insertions, 2 deletions

diff --git a/src/corelib/tools/qvector.h b/src/corelib/tools/qvector.h
index 9418642752..6f068dc4b0 100644
--- a/src/corelib/tools/qvector.h
+++ b/src/corelib/tools/qvector.h
@@ -574,8 +574,9 @@ void QVector<T>::append(const T &t)
 {
     if (d->ref != 1 || d->size + 1 > d->alloc) {
         const T copy(t);
-        realloc(d->size, QVectorData::grow(sizeOfTypedData(), d->size + 1, sizeof(T),
-                                           QTypeInfo<T>::isStatic));
+        realloc(d->size, (d->size + 1 > d->alloc) ?
+                    QVectorData::grow(sizeOfTypedData(), d->size + 1, sizeof(T), QTypeInfo<T>::isStatic)
+                    : d->alloc);
         if (QTypeInfo<T>::isComplex)
             new (p->array + d->size) T(copy);
         else