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On a clean install of Tumbleweed (BTRFS) in VMware workstation 14, I tried
booting from a snapper snapshot. After selecting the snapshot to boot from, it
does not boot. Instead if gives the following error message:

   error: null src bitmap in grub_video_bitmap_create_scaled.
   Press any key to continue...

The result is that one cannot rollback to a snapper snapshot, in case the
system breaks. Kind of a major issue.



Reproducible: Always

Steps to Reproduce:
1. Installed Tumbleweed as virtual machine in VMware Workstation 14.
2. In the bootscreen, selected the following:
   a) Start bootloader from a read-only snapshot
   b) Select whatever snapshot your prefer.
   c) Bootable snapshot #2
3. At this point, the following option is shown:
  "If OK, run 'snapper rollback' and rebot.
4. Clicked <enter> to continue.

Actual Results:  
Now the screen shows:
  error: null src bitmap in grub_video_bitmap_create_scaled.
  Press any key to continue...

Expected Results:  
The correct result would be that the snapshot is booted.

What I tried to fix it:

Disabled "Use graphical console" in the kernel parameters of Yast's Bootloader
section, to determine if the problem is caused by the openSUSE theme. This
didn't resolve the problem unfortunately.