UI: Quick Apply rows are left-aligned

Rows without a shortcut or style kind were drawn with their label
centred, because add_sized lays a button out centred and only the rows
with a shortcut have an element that fills the remaining width. Each
row is now laid out left to right in a fixed 460×22 area.

crates/ui-egui/src/menus.rs

@@ -1942,7 +1942,13 @@ pub fn palette(app: &mut DesignApp, ctx: &egui::Context) {
                 } else if !it.kind.is_empty() {
                     b = b.shortcut_text(it.kind);
                 }
-                if ui.add_sized([460.0, 22.0], b).clicked() || (i == 0 && ui.input(|i| i.key_pressed(egui::Key::Enter))) {
+                // The button aligns its label by the layout it's in: left, like the rows with a shortcut.
+                let size = egui::vec2(460.0, 22.0);
+                let row =
+                    ui.allocate_ui_with_layout(size, egui::Layout::left_to_right(egui::Align::Center).with_main_align(egui::Align::Min), |ui| {
+                        ui.add(b.min_size(size))
+                    });
+                if row.inner.clicked() || (i == 0 && ui.input(|i| i.key_pressed(egui::Key::Enter))) {
                     run = Some((it.id.clone(), it.params.clone()));
                 }
             }
@@ -2410,6 +2416,39 @@ mod tests {
         assert_eq!(app.session.documents().len(), 1, "the first entry (New Document) didn't run");
     }
 
+    #[test]
+    fn quick_apply_rows_are_left_aligned() {
+        let mut app = crate::DesignApp::new(designcraft_engine::Session::new(), crate::Services::default());
+        app.session.execute("file.new", &json!({})).unwrap();
+        app.ui.palette = Some(String::new());
+        let ctx = egui::Context::default();
+        let mut shapes = Vec::new();
+        for _ in 0..3 {
+            let input =
+                egui::RawInput { screen_rect: Some(egui::Rect::from_min_size(egui::Pos2::ZERO, egui::vec2(1400.0, 900.0))), ..Default::default() };
+            let mut out = ctx.run_ui(input, |ui| {
+                app.logic(&ui.ctx().clone());
+                app.ui(ui);
+            });
+            out.textures_delta.clear();
+            shapes = out.shapes;
+        }
+        let label_x = |label: &str| {
+            // The palette is painted last, over anything else with the same text.
+            shapes.iter().rev().find_map(|s| match &s.shape {
+                egui::Shape::Text(t) if t.galley.text() == label => Some(t.pos.x),
+                _ => None,
+            })
+        };
+        // Rows that show a shortcut or a style kind, and rows that show neither, among the first visible ones.
+        let items = quick_apply_items(&app.session, "");
+        let first = items.iter().take(10);
+        let plain = first.clone().find(|it| it.shortcut.is_none() && it.kind.is_empty()).expect("a row without a shortcut");
+        let with_sc = first.clone().find(|it| it.shortcut.is_some()).expect("a row with a shortcut");
+        let (a, b) = (label_x(&plain.label).expect("plain row drawn"), label_x(&with_sc.label).expect("shortcut row drawn"));
+        assert!((a - b).abs() < 0.5, "{:?} at x {a}, {:?} at x {b}", plain.label, with_sc.label);
+    }
+
     #[test]
     fn sample_scripts_run() {
         let mut app = crate::DesignApp::new(designcraft_engine::Session::new(), crate::Services::default());