Fix after dropping a selection via Copy (Selection + Ctrl), handlers …

…are not positioned correctly (fix aseprite#3977)

This fix disables FineControl when the transformation doesn't include
rotation or skew.
Also this fix improves the regular movement of selected image.

src/app/ui/editor/pixels_movement.cpp

@@ -375,12 +375,8 @@ void PixelsMovement::moveImage(const gfx::PointF& pos, MoveModifier moveModifier
   switch (m_handle) {
 
     case MovePixelsHandle: {
-      double dx = (pos.x - m_catchPos.x);
-      double dy = (pos.y - m_catchPos.y);
-      if ((moveModifier & FineControl) == 0) {
-        if (dx >= 0.0) { dx = std::floor(dx); } else { dx = std::ceil(dx); }
-        if (dy >= 0.0) { dy = std::floor(dy); } else { dy = std::ceil(dy); }
-      }
+      double dx = (std::floor(pos.x) - std::floor(m_catchPos.x));
+      double dy = (std::floor(pos.y) - std::floor(m_catchPos.y));
 
       if ((moveModifier & LockAxisMovement) == LockAxisMovement) {
         if (std::abs(dx) < std::abs(dy))