The tostring() comparison fix wasn't sufficient - jump-to-end was still
firing on nearly every incoming line while jump-to-end-on-focus was on.
AppendToNotepad's own SetSel/ReplaceSel appears to momentarily perturb
GetFocus() around each append, which poll_output_focus was reading as a
genuine "just switched to the window" edge. Now skips the jump if a
SmartAppendToNotepad call happened within the last 0.5s.
b95f743bb2