fix: restore shell and cut wall topology in 0.2.1

crates/ui-egui/src/viewport_layout.rs

@@ -42,16 +42,14 @@ impl Layout {
     pub fn new(viewport: Rect, docks: &[Rect], scale: f32) -> Self {
         let scale = if scale.is_finite() && scale > 0.0 { scale } else { 1.0 };
         let mut obstacles: Vec<_> = docks.iter().take(6).copied().filter(|r| r.is_finite()).map(|r| r.expand(4.0)).collect();
-        let available = free_rect(viewport, &obstacles);
-        let axis_view = if available.width() >= 116.0 && available.height() >= 116.0 {
+        // Navigation is anchored to the viewport, never to transient dialog space.
+        let available = viewport;
+        let mut axis_view = if available.width() >= 116.0 && available.height() >= 116.0 {
             Rect::from_min_size(pos2(available.right() - 116.0, available.top()), vec2(116.0, 116.0))
         } else {
             Rect::NOTHING
         };
-        if axis_view.is_positive() {
-            obstacles.push(axis_view);
-        }
-        let nav_space = free_rect(viewport, &obstacles);
+        let nav_space = viewport;
         let columns = ((nav_space.width() - 10.0) / 30.0).floor().clamp(1.0, 10.0);
         let nav_height = (10.0 / columns).ceil() * 30.0;
         let navigation = if nav_space.width() >= columns * 30.0 + 10.0 && nav_space.height() >= nav_height + 7.0 {
@@ -59,6 +57,14 @@ impl Layout {
         } else {
             Rect::NOTHING
         };
+        // On tiny viewports keep the bottom controls usable rather than overlapping them.
+        // This decision depends only on viewport size, never on an overlay.
+        if axis_view.intersect(navigation).is_positive() {
+            axis_view = Rect::NOTHING;
+        }
+        if axis_view.is_positive() {
+            obstacles.push(axis_view);
+        }
         if navigation.is_positive() {
             obstacles.push(navigation);
         }