Simplifying drop shadow

Also making example regeneration automatic in CI for the guide

.github/workflows/docs.yml

@@ -48,6 +48,10 @@ jobs:
         run: |
           cargo install mdbook-variables
 
+      - name: Regenerate Example Images
+        run: |
+          CAPTURE=1 cargo test -p guide-examples --examples
+
       - name: Build Guide
         run: |
           ./mdbook build guide

guide/guide-examples/src/lib.rs

@@ -72,7 +72,7 @@ impl BookExample {
             name,
             recorder: interface
                 .contain()
-                .shadow(ContainerShadow::drop(Px::new(16), Px::new(32)))
+                .shadow(ContainerShadow::drop(Px::new(16)))
                 .width(Px::new(750))
                 .build_recorder()
                 .with_alpha()

src/widgets/container.rs

@@ -704,16 +704,14 @@ impl<Unit> ContainerShadow<Unit> {
         }
     }
 
-    /// Returns a drop shadow placed `distance` below with a combined
-    /// blur/spread radius of `blur`.
-    pub fn drop(distance: Unit, blur: Unit) -> Self
+    /// Returns a drop shadow placed `distance` below.
+    pub fn drop(distance: Unit) -> Self
     where
         Unit: Zero + Div<i32, Output = Unit> + Default + Copy,
     {
-        let half_blur = blur / 2;
         Self::new(Point::new(Unit::ZERO, distance))
-            .blur_radius(half_blur)
-            .spread(half_blur)
+            .blur_radius(distance)
+            .spread(distance / 2)
     }
 
     /// Sets the shadow color and returns self.

src/widgets/layers.rs

@@ -870,7 +870,7 @@ impl WrapperWidget for Tooltipped {
                                         .clone()
                                         .contain()
                                         .background_color(background_color)
-                                        .shadow(ContainerShadow::drop(Lp::mm(1), Lp::mm(2))),
+                                        .shadow(ContainerShadow::drop(Lp::mm(1))),
                                 )
                                 .hide_on_unhover()
                                 .near(my_id, data.direction)