Missing feedback when file cannot be opened from 'git show'

1. Have a sparse checkout of a git repository, i.e. some files from the repository are not written to the file system.
   You get such using: git clone --sparse <source repo>
2. Show a commit from this repository in Creator.
3. In the displayed diff, double-click a change to a file which is not part of the sparse checkout, i.e. which does not exist in the file system.
   Nothing happens.

Since in this situation the file cannot be opened as usual, Creator should inform the user why it cannot be done.

Or would it even be possible that Creator creates a temporary copy of the changed file?