Identity keying answers panel A versus panel B on its own: the bank is
keyed by BufferId, so a different buffer starts from zero for free. It
cannot answer close-and-reopen of the SAME persistent buffer. The
successor carries the same id, so nothing about the key distinguishes
it from the panel the user was actually scrolling, and a notch begun in
a panel that no longer exists completes in its replacement.
The Absent arm already resets nine pieces of panel state one line at a
time --- frame, plan, drag, hover, pointer_held, last cell, gesture
cell, generation. The wheel residual was missing from that list, the
same shape of omission as the horizontal origin missing from the TUI's
four replacement resets.
The row closes the panel and reopens it at panel_epoch 2 on the same
buffer, which is precisely the case buffer_id cannot see, and asserts
the reopened panel's first sub-tick reaches nothing. Dropping
clear_panels() from the Absent arm fires it and nothing else.
This closes the last of B1's owed evidence.
Gates: fmt; clippy --workspace --all-targets -D warnings (which caught
a needless mut); pmacs-gpu 321; --lib 2009; git diff --check.
Levi Neuwirth
241e82e30e