Disclosure arrows in list rows could only be text: the trailing slot draws a string, so apps fell back to the "›" glyph at 14 px, which cannot use the theme's arrow SVGs and looks thin next to 24 px leading icons. Add ListItem::trailing_icon( rgba, w, h ): a right-aligned icon drawn at the new theme::TRAILING_ICON_SIZE (21 px, 1.5x the old glyph em box), vertically centered. It coexists with trailing text, which shifts to the icon's left. Like the leading icon, symbolic assets are pre-tinted by the caller (tint_symbolic), so the widget stays colour-agnostic.
Add ListItem::pad_h( impl Into<Length> ), a per-item override of the horizontal inset between the row edge and its content (leading icon/label on the left, trailing text/icon on the right). Resolution follows the Separator pattern: an explicit Length wins, otherwise the theme default (16 px through geom_px) applies, so existing rows are unaffected. This lets an app whose enclosing view already provides the margin bring row content flush instead of stacking both insets.
Document both builders in docs/widgets.md and the changelog, and rework the list_item rustdoc example to point at trailing_icon with a theme icon for disclosure arrows instead of the text glyph.
Pedro M. de Echanove Pasquin
d31e7222da