Polygonal Lasso: make the Shift constraint helper visible to its tests; cargo fmt

Co-Authored-By: Claude Opus 5.5 <[email protected]>

crates/ui-egui/src/canvas.rs

@@ -4221,7 +4221,7 @@ pub(crate) fn selection_mode(app: &PhotocraftApp, m: egui::Modifiers) -> &'stati
 
 /// Shift constrains a Polygonal Lasso segment to Photoshop's 45° directions.
 /// Work in document coordinates so zoom, view rotation and mirroring cannot skew it.
-fn constrained_polygon_point(from: [f64; 2], point: [f64; 2]) -> [f64; 2] {
+pub(crate) fn constrained_polygon_point(from: [f64; 2], point: [f64; 2]) -> [f64; 2] {
     let dx = point[0] - from[0];
     let dy = point[1] - from[1];
     if !dx.is_finite() || !dy.is_finite() {
@@ -4256,11 +4256,7 @@ fn polygon_click(app: &mut PhotocraftApp, x: f64, y: f64, mods: egui::Modifiers)
     }
     // Only constrain segments after the first vertex; the first click still sets selection intent.
     // Alt-drag is freehand and must not snap to an angle.
-    let point = if mods.shift && !mods.alt {
-        app.ui.polygon.last().copied().map_or([x, y], |last| constrained_polygon_point(last, [x, y]))
-    } else {
-        [x, y]
-    };
+    let point = if mods.shift && !mods.alt { app.ui.polygon.last().copied().map_or([x, y], |last| constrained_polygon_point(last, [x, y])) } else { [x, y] };
     app.ui.polygon.push(point);
 }
 

crates/ui-egui/src/polygon_lasso_tests.rs

@@ -367,8 +367,7 @@ fn shift_constrains_polygonal_lasso_segments_but_unmodified_clicks_remain_free()
 #[test]
 fn shift_polygonal_lasso_snap_has_all_eight_directions_and_handles_zero_length() {
     let origin = [200.0, 150.0];
-    let directions = [[40.0, 1.0], [40.0, 25.0], [1.0, 40.0], [-40.0, 25.0],
-                      [-40.0, -1.0], [-40.0, -25.0], [-1.0, -40.0], [40.0, -25.0]];
+    let directions = [[40.0, 1.0], [40.0, 25.0], [1.0, 40.0], [-40.0, 25.0], [-40.0, -1.0], [-40.0, -25.0], [-1.0, -40.0], [40.0, -25.0]];
     for delta in directions {
         let end = crate::canvas::constrained_polygon_point(origin, [origin[0] + delta[0], origin[1] + delta[1]]);
         let dx = end[0] - origin[0];