Recreate a default bounds object on every KisMask::setImage() call

Basically, default bounds objects may be shared among multiple objects
so changing it is not safe.

CCBUG:345619

krita/image/kis_default_bounds.cpp

@@ -47,11 +47,6 @@ KisDefaultBounds::~KisDefaultBounds()
     delete m_d;
 }
 
-void KisDefaultBounds::setImage(KisImageWSP image)
-{
-    m_d->image = image;
-}
-
 QRect KisDefaultBounds::bounds() const
 {
     /**

krita/image/kis_default_bounds.h

@@ -37,8 +37,6 @@ public:
     KisDefaultBounds(KisImageWSP image = 0);
     virtual ~KisDefaultBounds();
 
-    void setImage(KisImageWSP image);
-
     QRect bounds() const;
     bool wrapAroundMode() const;
 

krita/image/kis_mask.cc

@@ -95,11 +95,9 @@ KisMask::~KisMask()
 
 void KisMask::setImage(KisImageWSP image)
 {
-    KisDefaultBoundsBaseSP db = m_d->selection->pixelSelection()->defaultBounds();
-    KisDefaultBounds *defaultBounds = dynamic_cast<KisDefaultBounds*>(db.data());
-    if (defaultBounds) {
-        defaultBounds->setImage(image);
-    }
+    KisPaintDeviceSP parentPaintDevice = parent() ? parent()->original() : 0;
+    KisDefaultBoundsBaseSP defaultBounds = new KisSelectionDefaultBounds(parentPaintDevice, image);
+    m_d->selection->setDefaultBounds(defaultBounds);
 }
 
 bool KisMask::allowAsChild(KisNodeSP node) const