Cause: in list mode `drawAsContacts()` adds a margin (`adjust(-30, -4, 4, 4)`) to `boundingRect()`, and the horizontal test in `stackAtBottom()` uses that rect. Two lists overlapping only inside the empty margin (1.4 units in my log) count as overlapping. `gap` only changes how far the raised ones move, not which ones.
Fix: test the content only in list mode (`rect.adjust(30, 0, -4, 0)`), with the two margins as constants shared with `drawAsContacts()`.
Result: all references stay at the bottom (980 -> 980), none raised by mistake, also when moving an element sideways.
Checked: [to complete: same-column coils in list mode still stack, cross mode unchanged]
Laurent Trinques
bbb8e5d2e2