UPDATE: The second bug (which is started with "Also, I found another bug! I am learning...") is fixed in 1.4.0
About the first bug: screen clears on real hardware, so it is really bug. Also, it is reproducible with Qemu 1.4.0 and Qemu 5e3a0f418c4d57399778cee0b55aebfb663b6425.
UPDATE: The second bug (which is started with "Also, I found another bug! I am learning...") is fixed in 1.4.0
About the first bug: screen clears on real hardware, so it is really bug. Also, it is reproducible with Qemu 1.4.0 and Qemu 5e3a0f418c4d573 99778cee0b55aeb fb663b6425.