Ensure AnimatedImage currentFrame/onCurrentFrameChanged 2.0 compatibility

Change 5d995ae122aa07486ead849560b74d2b62b883bb did not make the actual
QQuickImageBase::currentFrameChanged signal accessible to the Qt Quick
2.0 revision. Normally the QML engine would implement a JS
onCurrentFrameChanged handler by connecting to the currentFrame
property's frameChanged notifier signal; but in this case it tried to
connect to the explicit QQuickImageBase::currentFrameChanged signal
instead (because the name is a better match), and failed because of the
revision. So we need another duplicate unrevisioned signal
QQuickAnimatedImage::currentFrameChanged for use when the import is less
than Qt Quick 2.14.

As pointed out during review, an autotest for the revisioning is good to
have anyway.

Fixes: QTBUG-78713
Task-number: QTBUG-77506
Change-Id: I121508acac81d47e3c0a4c0ed12257c10b30970b
Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

1 files changed, 2 insertions, 1 deletions

diff --git a/src/quick/items/qquickanimatedimage.cpp b/src/quick/items/qquickanimatedimage.cpp
index bebefc1b22..18d492cd68 100644
--- a/src/quick/items/qquickanimatedimage.cpp
+++ b/src/quick/items/qquickanimatedimage.cpp
@@ -140,6 +140,7 @@ QQuickAnimatedImage::QQuickAnimatedImage(QQuickItem *parent)
 {
     connect(this, &QQuickImageBase::cacheChanged, this, &QQuickAnimatedImage::onCacheChanged);
     connect(this, &QQuickImageBase::currentFrameChanged, this, &QQuickAnimatedImage::frameChanged);
+    connect(this, &QQuickImageBase::currentFrameChanged, this, &QQuickAnimatedImage::currentFrameChanged);
     connect(this, &QQuickImageBase::frameCountChanged, this, &QQuickAnimatedImage::frameCountChanged);
 }
 
@@ -466,7 +467,7 @@ void QQuickAnimatedImage::movieUpdate()
 
     if (d->movie) {
         d->setPixmap(*d->infoForCurrentFrame(qmlEngine(this)));
-        emit currentFrameChanged();
+        emit QQuickImageBase::currentFrameChanged();
     }
 }