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CoHModConfigUI TODO

Dropdown Hairline On 4-Item Enums

Status: Deferred for later polish.

Context:

  • In the 4-item enum case, the dropdown should behave like a no-scroll variant.
  • The major scrollbar behavior is already correct: no active scrolling is needed until there are 5 or more choices.
  • A very thin black vertical line can still appear at the right edge of the opened 4-item dropdown.

What was verified on 2026-03-30:

  • Cheat Engine inspection showed the scrollbar subtree is effectively collapsed in the 4-item case.
  • btnDec and btnInc were collapsed.
  • btnPgUp and btnPgDn were not acting like a visible scrollbar lane.
  • The cloned dropdown item widgets were already using the narrow content width.
  • The remaining artifact appears to come from native dropdown/listbox root behavior, not from the populated item text path.

Current code assumptions:

  • Scrollbar visibility is controlled by choiceCount > 4 in src/UiInterop.cpp.
  • For 4 or fewer choices, the code hides the scrollbar and narrows the no-scroll listbox root/content geometry.
  • This fixed the major width mismatch, but not the last hairline seam.

Likely follow-up when revisiting:

  • Compare against a native in-game dropdown that opens with exactly 4 visible rows, if one can be found.
  • Inspect whether the line is a border/separator from the listbox root Presentation rather than a true scrollbar child.
  • If needed, adjust the no-scroll listbox root styling/state separately from the scrollbar subtree.