From 1b34289608105e6a7e8585462e602e7a9a94dd85 Mon Sep 17 00:00:00 2001
From: rustbasic <127506429+rustbasic@users.noreply.github.com>
Date: Wed, 20 Mar 2024 20:55:44 +0900
Subject: [PATCH] Fix bug in `Context::parent_viewport_id` (#4190)

* Closes #4084

Fix : Display parent viewport id Issues
---
 crates/egui/src/context.rs | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/crates/egui/src/context.rs b/crates/egui/src/context.rs
index d0d6b9ca..ea61cd7d 100644
--- a/crates/egui/src/context.rs
+++ b/crates/egui/src/context.rs
@@ -592,11 +592,11 @@ impl ContextImpl {
     ///
     /// For the root viewport this will return [`ViewportId::ROOT`].
     pub(crate) fn parent_viewport_id(&self) -> ViewportId {
-        self.viewport_stack
-            .last()
-            .copied()
-            .unwrap_or_default()
-            .parent
+        let viewport_id = self.viewport_id();
+        *self
+            .viewport_parents
+            .get(&viewport_id)
+            .unwrap_or(&ViewportId::ROOT)
     }
 
     fn all_viewport_ids(&self) -> ViewportIdSet {