Owner live-client report 2026-09-07 ("Drop down menus look horrible, there
is also a checkmark on the text there"): the prior S7 fix only replaced the
CLOSED-state button face when RetailButtonArt=false. The OPEN popup still
drew retail's sprite art unconditionally — the tan/orange gradient panel
(PopupBgSprite), the per-row highlight sprite (which bakes a checkbox/
checkmark glyph into its leftmost ~17px, per TextIndent's doc comment), and
the ornate gold scrollbar chrome — regardless of the menu's style.
UiMenu.OnDrawOverlay now branches on RetailButtonArt before ever reading
SpriteResolve: plain mode draws through two new methods (DrawGridPopupPlain,
DrawScrollablePopupPlain) that use only DrawFill/DrawRectOutline — flat
background + 1px border, the current entry filled like a list selection
(PlainSelectedColor, same value as UiMarkupList.SelectedColor), a new
hover fill (PlainHoverColor) for the row under the pointer, and left-aligned
text at PlainPadding. No checkmark is possible by construction since plain
mode never resolves or draws any sprite. Hover tracking needed a small new
mechanism: UiMenu.ReceivesHoverMouseMove now returns true while a plain
popup is open, so UiRoot's hover dispatch keeps delivering MouseMove to
_hoveredPopupIndex (reset on every open/close transition and on
HoverLeave). Scrollbar overflow (DrawPopupScrollbarPlain) draws a 1px-
bordered track and a flat thumb, both in PlainBorderColor, sharing the
exact UiScrollbar.ThumbRect geometry the hit-test math already uses — no
DAT track/thumb/arrow-button art. Hit-testing (OnHitTest/OnEvent's
MouseDown pick logic) is untouched; the retail sprite branch is now a
separate, unmodified path proven byte-identical by a new golden test.
Mutation proof: reverting UiMenu.cs alone (keeping the new tests) fails the
build outright — the six new tests reference PlainSelectedColor/
PlainHoverColor, which only exist after this change (CS1061 with the old
class). Filters run: AcDream.App.Tests Markup|UiMenu|Menu|Scrollbar
(242 passed, 3 pre-existing unrelated Lane=Manual live-DAT-probe failures
that require ACDREAM_PROBE_LIVE_MOUNT=1 and predate this change) and
AcDream.Plugins.MossTank.Tests Markup (9/9 passed).
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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