Re: [PATCH] vt: fix memory overlapping when deleting chars in the buffer

[Yangxi Xiang]

> And what commit id does this fix, or has it always been broken?

It fixes the commit 81732c3 (tty vt: Fix line garbage in virtual
console on command line edition). The line buffer is not always
broken, because the memcpy utilized the hardware acceleration, whose
result is not deterministic. I fix this issue by replacing the
scr_memcpyw with scr_memmovew used in insert_char, and preserving the
memcpy optimization when the buffers are not overlapping.

Yangxi Xiang