From c5cc4ce2215846feaadec605e9052e8a0b10a660 Mon Sep 17 00:00:00 2001
From: enricoturri1966 <enricoturri@seznam.cz>
Date: Tue, 24 Aug 2021 11:31:04 +0200
Subject: [PATCH] Fixed sequential print clearance contours not disappearing
 after undo

---
 src/slic3r/GUI/Plater.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index fa53522d1..3884fbca4 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -2944,6 +2944,9 @@ unsigned int Plater::priv::update_background_process(bool force_validation, bool
     if (view3D->is_layers_editing_enabled())
         view3D->get_wxglcanvas()->Refresh();
 
+    if (background_process.empty())
+        view3D->get_canvas3d()->reset_sequential_print_clearance();
+
     if (invalidated == Print::APPLY_STATUS_INVALIDATED) {
         // Some previously calculated data on the Print was invalidated.
         // Hide the slicing results, as the current slicing status is no more valid.