The live tell that triggers an Auto-Tell-Tab spawn is already in the
message store by the time MessageProcessed fires, because
MessageManager calls Store.UpsertMessage on line 266 before invoking
the event on line 277. PreloadHistory therefore picked up the live
tell as the youngest historic message and the separator landed below
it instead of above.
Pass the live message id through SpawnTempTab into PreloadHistory and
filter it out of the result. Pull one extra row so a successful
exclude does not cost the user a preload-budget slot.
JonKazama-Hellion