From 98bced7e62a35455a79c154d23540e72134a36b5 Mon Sep 17 00:00:00 2001
From: Emil Ernerfeldt <emilernerfeldt@gmail.com>
Date: Fri, 28 Aug 2020 15:43:00 +0200
Subject: [PATCH] [ui] bug fix: default size of horizontal/vertical regions

---
 egui/src/ui.rs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/egui/src/ui.rs b/egui/src/ui.rs
index 0a4555b1..5ee12d6d 100644
--- a/egui/src/ui.rs
+++ b/egui/src/ui.rs
@@ -609,7 +609,12 @@ impl Ui {
         layout: Layout,
         add_contents: impl FnOnce(&mut Self) -> R,
     ) -> (R, Rect) {
-        let child_rect = Rect::from_min_max(self.cursor, self.bottom_right());
+        let initial_size = if layout.dir() == Direction::Horizontal {
+            vec2(self.available().width(), 0.0)
+        } else {
+            vec2(0.0, self.available().height())
+        };
+        let child_rect = Rect::from_min_size(self.cursor, initial_size);
         let mut child_ui = self.child_ui(child_rect);
         child_ui.set_layout(layout); // HACK: need a separate call right now
         let ret = add_contents(&mut child_ui);