The multi selection of cameras produces incorrect previews

1. If one camera is selected, the size of its preview matches it's proportions in the game preview
2. If two cameras are selected, the preview of the smaller one will extend to fit the size of the bigger one.
3. If many cameras are selected - in this case 6 - the previews are stacked up and not all of them are visible. When trying to expand the Scene view down the previews become bigger preventing the remaining 2 previews to show.