TZUTC: -0700
MSGID: 58479.sync_sys@1:103/705 2d00a663
PID: Synchronet 3.21a-Linux master/27cbebcb9 Aug 10 2025 GCC 12.2.0
TID: SBBSecho 3.29-Linux master/27cbebcb9 Aug 10 2025 GCC 12.2.0
BBSID: VERT
CHRS: UTF-8 4
FORMAT: flowed
https://gitlab.synchro.net/main/sbbs/-/issues/953#note_7529

Not "unique" in any way... basically, v3.20 thought something worth pausing
for was written after the last CUP sequence and v3.21 knows that is not true.

There's really two contributing factors here:

1. The line counter is reset on ANSI animation where "ANSI animation" is
defined as "something that moves to a different line".
2. The line counter does not increment from zero for blank lines where "blank
line" was very complicated in v3.20 and is simpler, but still not documented
in v3.21.

The basic difference is that how the cursor is moved around used to result in
column being incorrect, but now column is correct, so the result is detected
as a blank lines which, at the top of a new screen, do not increment the line
counter.
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