style: apply rustfmt formatting across test framework and flex_box

cargo fmt pass: multi-line chaining, assert_eq reformatting, getter line breaks, trailing newline cleanup, flex_box length_sum/map formatting. No logic changes.

Author: TtTRz

float-pigment-forest/build.rs

@@ -42,7 +42,10 @@ fn main() {
             let html = fs::read_to_string(&abs).unwrap_or_default();
             let ignore = html.contains("data-ignore=\"true\"");
             let body = translate_html(&html);
-            by_topic.entry(topic).or_default().push((name, body, ignore));
+            by_topic
+                .entry(topic)
+                .or_default()
+                .push((name, body, ignore));
         }
     }
 

float-pigment-forest/tests/custom/imperative_api_check.rs

@@ -39,11 +39,7 @@ fn imperative_grid_equivalent_to_from_str() {
 
     // Helper: append a div with text content under parent. Returns the div
     // handle so we can assert against it.
-    fn append_div_with_text(
-        ctx: &mut TestCtx,
-        parent: NodeHandle,
-        text: &str,
-    ) -> NodeHandle {
+    fn append_div_with_text(ctx: &mut TestCtx, parent: NodeHandle, text: &str) -> NodeHandle {
         let div = ctx.create_node("div");
         let t = ctx.create_text(text);
         ctx.append(div, t);
@@ -58,7 +54,7 @@ fn imperative_grid_equivalent_to_from_str() {
 
     // Row 2 (template row height 40px)
     let n4 = append_div_with_text(&mut ctx, n0, "content1"); // left=0
-    // content2 has an explicit inline style overriding width/height.
+                                                             // content2 has an explicit inline style overriding width/height.
     let n5 = ctx.create_node("div");
     ctx.set_style(n5, "width: 23px; height: 23px");
     let t5 = ctx.create_text("content2");
@@ -84,7 +80,11 @@ fn imperative_grid_equivalent_to_from_str() {
     // Row 2 — 40px template row, except content2 which sets its own height.
     assert_eq!(ctx.height(n4), 40.0, "content1 height");
     assert_eq!(ctx.left(n4), 0.0, "content1 left");
-    assert_eq!(ctx.height(n5), 23.0, "content2 height (inline style override)");
+    assert_eq!(
+        ctx.height(n5),
+        23.0,
+        "content2 height (inline style override)"
+    );
     assert_eq!(ctx.left(n5), 250.0, "content2 left");
     assert_eq!(ctx.height(n6), 40.0, "content3 height");
     assert_eq!(ctx.left(n6), 350.0, "content3 left");

float-pigment-forest/tests/custom/mod.rs

@@ -3,6 +3,3 @@ mod css_inline;
 mod css_margin;
 mod css_margin_collapse;
 mod imperative_api_check;
-
-
-

float-pigment-forest/tests/mod.rs

@@ -308,13 +308,28 @@ impl TestCtx {
     // ===== 命令式 getters（layout_imperative 之后读节点的尺寸/位置/margin）=====
 
     pub fn width(&self, n: NodeHandle) -> f32 {
-        unsafe { (*self.imperative_built[n.0]).layout_position().width.to_f32() }
+        unsafe {
+            (*self.imperative_built[n.0])
+                .layout_position()
+                .width
+                .to_f32()
+        }
     }
     pub fn height(&self, n: NodeHandle) -> f32 {
-        unsafe { (*self.imperative_built[n.0]).layout_position().height.to_f32() }
+        unsafe {
+            (*self.imperative_built[n.0])
+                .layout_position()
+                .height
+                .to_f32()
+        }
     }
     pub fn left(&self, n: NodeHandle) -> f32 {
-        unsafe { (*self.imperative_built[n.0]).layout_position().left.to_f32() }
+        unsafe {
+            (*self.imperative_built[n.0])
+                .layout_position()
+                .left
+                .to_f32()
+        }
     }
     pub fn top(&self, n: NodeHandle) -> f32 {
         unsafe { (*self.imperative_built[n.0]).layout_position().top.to_f32() }

float-pigment-layout/src/algo/flex_box.rs

@@ -538,14 +538,12 @@ impl<T: LayoutTreeNode> FlexBox<T> for LayoutUnit<T> {
         {
             requested
         } else {
-            let total_main_axis_gap_all_lines: T::Length = length_sum(
-                flex_lines
-                    .iter()
-                    .map(|l| sum_axis_gaps(
-                        main_axis_gap::<T>(dir, style, node, &requested_inner_size),
-                        l.items.len(),
-                    )),
-            );
+            let total_main_axis_gap_all_lines: T::Length = length_sum(flex_lines.iter().map(|l| {
+                sum_axis_gaps(
+                    main_axis_gap::<T>(dir, style, node, &requested_inner_size),
+                    l.items.len(),
+                )
+            }));
             let max_content_size: T::Length = total_main_axis_gap_all_lines
                 + length_sum(
                     flex_lines