From b03440291262209c7bf92a4625992bc29485fb8f Mon Sep 17 00:00:00 2001
From: Lukas Matena <lukasmatena@seznam.cz>
Date: Mon, 3 Jan 2022 15:20:14 +0100
Subject: [PATCH] Fix of slow place on face on complex models #7587

---
 src/slic3r/GUI/Gizmos/GLGizmoFlatten.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/slic3r/GUI/Gizmos/GLGizmoFlatten.cpp b/src/slic3r/GUI/Gizmos/GLGizmoFlatten.cpp
index 9034d78d87..3f3956a544 100644
--- a/src/slic3r/GUI/Gizmos/GLGizmoFlatten.cpp
+++ b/src/slic3r/GUI/Gizmos/GLGizmoFlatten.cpp
@@ -249,7 +249,8 @@ void GLGizmoFlatten::update_planes()
         }
 
         if (discard) {
-            m_planes.erase(m_planes.begin() + (polygon_id--));
+            m_planes[polygon_id--] = std::move(m_planes.back());
+            m_planes.pop_back();
             continue;
         }