QQuickImage's QSGTextureProvider does not emit the textureChanged() signal

In qtdeclarative/src/quick/items/qquickimage.cpp around line 556 the m_texture variable of the QQuickImageTextureProvider (inheriting from QSGTextureProvider) is changed however the QSGTextureProvider::textureChanged signal is not emitted:

[...]
if (d->provider)

{ d->provider->m_smooth = d->smooth; d->provider->m_texture = texture; }

[...]