From 9650ef85d68a4a6566bea4011f14a57614f8ec9a Mon Sep 17 00:00:00 2001
From: Emil Ernerfeldt <emil.ernerfeldt@gmail.com>
Date: Tue, 19 May 2026 17:09:33 +0200
Subject: [PATCH] Smoother CollapsingHeader animation (#8177)

Animate the spacing between the header and the body. It's subtle, but
looks slightly nicer when closing a panel.
---
 crates/egui/src/containers/collapsing_header.rs | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/crates/egui/src/containers/collapsing_header.rs b/crates/egui/src/containers/collapsing_header.rs
index d921a5cbf..cad9d5b3e 100644
--- a/crates/egui/src/containers/collapsing_header.rs
+++ b/crates/egui/src/containers/collapsing_header.rs
@@ -189,6 +189,8 @@ impl CollapsingState {
             self.store(ui.ctx()); // we store any earlier toggling as promised in the docstring
             None
         } else if openness < 1.0 {
+            ui.add_space((openness - 1.0) * ui.spacing().item_spacing.y); // animate spacing too
+
             Some(ui.scope_builder(builder, |child_ui| {
                 let max_height = if self.state.open && self.state.open_height.is_none() {
                     // First frame of expansion.