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When running grub in a VGA console of a KVM pseries guest on PowerPC, you can see the cursor sweeping over the whole line when entering a character in editor mode. This is visible because grub always refreshes the whole line when entering a character in editor mode, and drawing characters is quite a slow operation with the firmware used for the powerpc pseries guests (SLOF). To avoid this ugliness, the cursor should be disabled when refreshing the screen contents during update_screen(). Signed-off-by: Thomas Huth <thuth@redhat.com>