This MR adds ability to select image using Return keyboard key.
In addition, it filters out on view side the grey box around selected image as shown in #208 (closed) and described in #210 (closed). I prefer not to filter it on model side as we may want later to add or switch to table/tree view as well. Hence it is better to filter it in the view.
Fixes: #208 (closed) and #210 (closed)
Edited by Marko Vendelin