From a4176ef9338e7a1984fd983661351275c7ff19f1 Mon Sep 17 00:00:00 2001
From: Lukas Matena <lukasmatena@seznam.cz>
Date: Fri, 24 Aug 2018 16:52:06 +0200
Subject: [PATCH] Bugfix - dialog that changes number of copies deleted the
 object when cancelled

---
 lib/Slic3r/GUI/Plater.pm | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/Slic3r/GUI/Plater.pm b/lib/Slic3r/GUI/Plater.pm
index dbdf0be27..cae167f28 100644
--- a/lib/Slic3r/GUI/Plater.pm
+++ b/lib/Slic3r/GUI/Plater.pm
@@ -995,9 +995,10 @@ sub set_number_of_copies {
     my $model_object = $self->{model}->objects->[$obj_idx];
     
     # prompt user
-    my $copies = Wx::GetNumberFromUser("", L("Enter the number of copies of the selected object:"), L("Copies"), $model_object->instances_count, 0, 1000, $self);
+    my $copies = -1;
+    $copies = Wx::GetNumberFromUser("", L("Enter the number of copies of the selected object:"), L("Copies"), $model_object->instances_count, 0, 1000, $self);
     my $diff = $copies - $model_object->instances_count;
-    if ($diff == 0) {
+    if ($diff == 0 || $copies == -1) {
         # no variation
         $self->resume_background_process;
     } elsif ($diff > 0) {