Plugin markup's <slider> always drew RetailScrollbarChrome's sprite
track/thumb, the same "big gold DAT art next to a plain plugin panel"
mismatch <menu style> already fixed for dropdowns. <slider style="..."> now
uses the identical plain/retail grammar (ValidateArtStyle, renamed and
generalized from the menu-only ValidateMenuStyle): plain (the default)
draws a flat dark track, 1px border, and a small flat nub via new
UiScrollbar.RetailArt=false + DrawPlainScalar — no SpriteResolve dependency
at all; style="retail" keeps RetailScrollbarChrome.ApplyHorizontal exactly
as before. RetailArt defaults to true on UiScrollbar itself, so every
non-plugin caller of this widget (retail LayoutDesc import, chat opacity
sliders, etc.) is byte-for-byte unaffected — only <slider>'s own
MarkupDocument case sets it false by default.
Every existing MossTank <slider> (Vitals' nine sliders, Buffs, Items'
Refill Worn Mana) has no style attribute, so they all switch to the plain
look automatically — consistent with the whole campaign's "no gold art"
direction, no XML changes needed.
Fixed a red pin this change created: Slider_MinMax_DrawsTheThumbAtTheRescaledNormalizedPosition
asserted the retail sprite thumb on a slider with no style attribute, which
now builds plain by default — opted it into style="retail" (same fix
shape as item 1's menu-scroll pin) and added a plain sibling,
Slider_NoStyleAttribute_DrawsAPlainFlatNubAtTheRescaledNormalizedPosition.
Mutation check: hardcoding DrawPlainScalar's horizontal nub x to 0 turned
the new plain test red ("expected a plain flat nub offset right of the
origin at 25%"); restoring the real ScalarPosition-driven x turns it green.
Documented <slider style> in docs/plugin-ui-markup.md, mirroring the
existing <menu style> paragraph.
tests/AcDream.Plugins.MossTank.Tests: 671/671 (unchanged — pure App-layer
rendering change, MossTank markup only sets no/default style).
tests/AcDream.App.Tests --filter Markup|Plugin|UiMenu|Slider: 278/3 skipped/281 (was 277/3/280, +1 new test).
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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