From ce0ea74c9fb21654fd181bce80d6436c8d92947b Mon Sep 17 00:00:00 2001
From: Emil Ernerfeldt <emilernerfeldt@gmail.com>
Date: Sat, 19 Dec 2020 11:17:21 +0100
Subject: [PATCH] Fix: The background of CentralPanel will now cover unused
 space too

---
 CHANGELOG.md                 | 4 ++++
 egui/src/containers/panel.rs | 6 +++++-
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5a11b845..c5ac04f5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -29,6 +29,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 * `Slider` and `DragValue` uses fewer decimals by default. See the full precision by hovering over the value.
 * `egui::App`: added `fn name(&self)` and `fn clear_color(&self)`.
 
+### Fixed 🐛
+
+* The background for `CentralPanel` will now cover unused space too.
+
 ### Deprecated
 * `RawInput::screen_size` - use `RawInput::screen_rect` instead.
 * left/centered/right column functions on `Ui`.
diff --git a/egui/src/containers/panel.rs b/egui/src/containers/panel.rs
index cdba01b7..0cc1d831 100644
--- a/egui/src/containers/panel.rs
+++ b/egui/src/containers/panel.rs
@@ -138,7 +138,11 @@ impl CentralPanel {
         let mut panel_ui = Ui::new(ctx.clone(), layer_id, id, panel_rect, clip_rect);
 
         let frame = Frame::background(&ctx.style());
-        let r = frame.show(&mut panel_ui, |ui| add_contents(ui));
+        let r = frame.show(&mut panel_ui, |ui| {
+            let r = add_contents(ui);
+            ui.expand_to_include_rect(ui.max_rect()); // Use it all
+            r
+        });
 
         let panel_rect = panel_ui.min_rect();
         let response = panel_ui.interact_hover(panel_rect);