Lists: draw an installed symbol font's bullet from its own glyph

A bare-code Wingdings bullet drawn as U+25AA came from a fallback face whose taller ascent made
every bulleted line about 1 pt taller than Word's. Where the symbol font is installed, its glyph at
the private-use code is drawn instead, with the font's own metrics.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

crates/layout/src/para.rs

@@ -1245,9 +1245,15 @@ pub fn layout_para(p: &Paragraph, env: &ParaEnv) -> ParaLayout {
         let r = wordcraft_fonts::word::resolve(&rc.font, rc.bold, rc.italic);
         let text: String = text
             .chars()
-            .map(|c| match wordcraft_fonts::word::symbol_font_char(&rc.font, c) {
-                Some(u) if r.substituted || !r.face.covers(c) => u,
-                _ => c,
+            .map(|c| {
+                // A bare code (`§` = 0xA7) in a symbol font that is installed: its glyph sits at the
+                // private-use code (U+F0A7); drawn from that font, the line keeps Word's metrics.
+                let private = (u32::from(c) < 0x100).then(|| char::from_u32(0xF000 + u32::from(c))).flatten();
+                match (private, wordcraft_fonts::word::symbol_font_char(&rc.font, c)) {
+                    (Some(pc), Some(_)) if !r.substituted && !r.face.covers(c) && r.face.covers(pc) => pc,
+                    (_, Some(u)) if r.substituted || !r.face.covers(c) => u,
+                    _ => c,
+                }
             })
             .collect();
         let before_c = b.clusters.len();

crates/layout/src/tests.rs

@@ -3963,7 +3963,17 @@ fn bare_code_wingdings_bullet_draws_its_square() {
     d.format_paragraphs(&Pos::body(0, 0), &Pos::body(0, 0), &|p| p.numbering = Some(wordcraft_doc::props::NumRef { num: id, level: 0 })).unwrap();
     let l = lay(&d);
     let label = l.pages[0].items.iter().find_map(|it| if let Placed::Lines { para, .. } = it { para.label.clone() } else { None }).unwrap();
+    // Where Wingdings is installed (Windows) its own glyph at the private-use code is drawn,
+    // which keeps Word's line height; elsewhere the standard square.
     let wd = wordcraft_fonts::word::resolve("Wingdings", false, false);
-    let expected = if wd.substituted || !wd.face.covers('\u{A7}') { "\u{25AA}" } else { "\u{A7}" };
+    let expected = if wd.substituted {
+        "\u{25AA}"
+    } else if wd.face.covers('\u{A7}') {
+        "\u{A7}"
+    } else if wd.face.covers('\u{F0A7}') {
+        "\u{F0A7}"
+    } else {
+        "\u{25AA}"
+    };
     assert_eq!(label.text, expected);
 }