Brush Settings: Brush Tip Shape lines up with the other section names (#4282) (#4294)

The section list indented every row without an enable box by the box's
width, except the first, so Brush Tip Shape started in the checkbox
column while Smoothing, the other box-less row, lined up with the names.
Photoshop indents Brush Tip Shape too. Every name now starts in the
same column.

Test: section_names_line_up_whether_or_not_they_have_a_box checks the
painted x of every section name (Brush Tip Shape was 20 px left before).

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

crates/ui-egui/src/brush_panel_tests.rs

@@ -599,6 +599,31 @@ fn editing_the_options_bar_amount_reenables_smoothing() {
     assert_eq!(last_journal(h.state()).unwrap().1["brush"]["smoothing"]["enabled"], true);
 }
 
+/// #4282: every name in the section list starts in the same column, Brush Tip Shape included,
+/// whether or not its row has an enable box (Photoshop indents the rows without one).
+#[test]
+fn section_names_line_up_whether_or_not_they_have_a_box() {
+    fn text_x(shape: &egui::Shape, out: &mut Vec<(String, f32)>) {
+        match shape {
+            egui::Shape::Text(text) => out.push((text.galley.job.text.clone(), text.pos.x)),
+            egui::Shape::Vec(shapes) => shapes.iter().for_each(|s| text_x(s, out)),
+            _ => {}
+        }
+    }
+    // Shape Dynamics is shown, so its heading paints too; the list's copy is the leftmost.
+    let h = harness(0, 1);
+    let mut painted = Vec::new();
+    for shape in &h.output().shapes {
+        text_x(&shape.shape, &mut painted);
+    }
+    let left = |name: &str| painted.iter().filter(|(t, _)| t == name).map(|(_, x)| *x).reduce(f32::min);
+    let columns: Vec<(&str, f32)> = SECTIONS.iter().map(|(name, _)| (*name, left(name).unwrap_or_else(|| panic!("{name} painted")))).collect();
+    let (_, boxed) = columns[1];
+    for (name, x) in &columns {
+        assert!((x - boxed).abs() < 0.5, "{name} starts at {x}, the boxed names at {boxed}: {columns:?}");
+    }
+}
+
 #[test]
 fn preview_strip_re_renders_only_when_the_brush_changes() {
     let mut h = harness(0, 0);