Set sharedPainter correctly for QGraphicsEffect

Autotest is taken from the previously reverted
8b1377fde16a2049a1c27f6d005bff84a8f85f28.

Task-number: QTBUG-60231
Change-Id: I44dd79cba22b6baefdd6d95c176790bef0b7eafe
Reviewed-by: Andy Nichols <andy.nichols@qt.io>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/widgets/kernel/qwidget.cpp b/src/widgets/kernel/qwidget.cpp
index de734b6f51..125f1cf246 100644
--- a/src/widgets/kernel/qwidget.cpp
+++ b/src/widgets/kernel/qwidget.cpp
@@ -5528,11 +5528,11 @@ void QWidgetPrivate::drawWidget(QPaintDevice *pdev, const QRegion &rgn, const QP
                 setSystemClip(pdev, rgn.translated(offset));
                 QPainter p(pdev);
                 p.translate(offset);
-                context.painter = &p;
+                context.painter = context.sharedPainter = &p;
                 graphicsEffect->draw(&p);
                 setSystemClip(pdev, QRegion());
             } else {
-                context.painter = sharedPainter;
+                context.painter = context.sharedPainter = sharedPainter;
                 if (sharedPainter->worldTransform() != sourced->lastEffectTransform) {
                     sourced->invalidateCache();
                     sourced->lastEffectTransform = sharedPainter->worldTransform();