From 7a0459756e419dee035eed9f1efc98523688ce43 Mon Sep 17 00:00:00 2001
From: facile pop culture reference <donotem@ilme.no>
Date: Sat, 25 Jul 2026 07:13:21 +0300
Subject: [PATCH] draw: try to fix splits

---
 src/draw/split.rs | 45 +++++++++++++++++++++++++++++++--------------
 1 file changed, 31 insertions(+), 14 deletions(-)

diff --git a/src/draw/split.rs b/src/draw/split.rs
index 1cee49c..2ee67b4 100644
--- a/src/draw/split.rs
+++ b/src/draw/split.rs
@@ -50,19 +50,36 @@ impl Split {
         thunk(move|to: &mut S|{
             let (area_a, area_b) = to.xywh().split_half(self);
             let (origin_a, origin_b) = self.origins();
-            let a = a.align(origin_a);
-            let b = b.align(origin_b);
-            match self {
-                Self::Below => {
-                    to.show(area(area_b, b))?;
-                    to.show(area(area_b, a))?;
-                },
-                _ => {
-                    to.show(area(area_a, a))?;
-                    to.show(area(area_b, b))?;
+            let (a, b) = match self {
+                Self::Below => (
+                    to.show(area(area_b, b.align(origin_b)))?,
+                    to.show(area(area_b, a.align(origin_a)))?,
+                ),
+                _ => (
+                    to.show(area(area_a, a.align(origin_a)))?,
+                    to.show(area(area_b, b.align(origin_b)))?,
+                )
+            };
+            Ok(if let (Some(XYWH(xa, ya, wa, ha)), Some(XYWH(xb, yb, wb, hb))) = (a, b) {
+                match self {
+                    Self::South =>
+                        Some(XYWH(xa.min(xb), ya, wa.max(wb), ha + hb)),
+                    Self::East =>
+                        Some(XYWH(xa, ya.min(yb), wa + wb, ha.max(hb))),
+                    Self::North =>
+                        Some(XYWH(xa.min(xb), yb, wa.max(wb), ha + hb)),
+                    Self::West =>
+                        Some(XYWH(xb, ya.min(yb), wa + wb, ha.max(hb))),
+                    Self::Above | Self::Below =>
+                        Some(XYWH(xa.min(xb), ya.min(yb), wa.max(wb), ha.max(hb))),
                 }
-            }
-            Ok(Some(to.xywh())) // FIXME: compute and return actually used area
+            } else if let Some(a) = a {
+                Some(a)
+            } else if let Some(b) = b {
+                Some(b)
+            } else {
+                None
+            })
         })
     }
 
@@ -89,8 +106,8 @@ impl Split {
             Self::East  => (E, W),
             Self::North => (N, S),
             Self::West  => (W, E),
-            Self::Above    => (C, C),
-            Self::Below  => (C, C),
+            Self::Above => (C, C),
+            Self::Below => (C, C),
         }
     }