From 0ab8b9a2d91a3142d5f3cad789716978a7360594 Mon Sep 17 00:00:00 2001
From: Wayne Stambaugh <stambaughw@gmail.com>
Date: Wed, 15 Jul 2020 20:57:17 -0400
Subject: [PATCH] Symbol editor: fix assertion attempting to copy an inherited
 symbol.

Copying or cutting an symbol to the clipboard using the context menu
in the library tree requires a root symbol.  Inherited symbols must
be flattened in order to properly be added to a symbol library.

Fixes https://gitlab.com/kicad/code/kicad/issues/4901
---
 eeschema/libedit/libedit.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/eeschema/libedit/libedit.cpp b/eeschema/libedit/libedit.cpp
index aee1505f05..b02a0c87fa 100644
--- a/eeschema/libedit/libedit.cpp
+++ b/eeschema/libedit/libedit.cpp
@@ -595,8 +595,9 @@ void LIB_EDIT_FRAME::CopyPartToClipboard()
     if( !part )
         return;
 
+    std::unique_ptr< LIB_PART> tmp = part->Flatten();
     STRING_FORMATTER formatter;
-    SCH_SEXPR_PLUGIN::FormatPart( part, formatter );
+    SCH_SEXPR_PLUGIN::FormatPart( tmp.get(), formatter );
 
     auto clipboard = wxTheClipboard;
     wxClipboardLocker clipboardLock( clipboard );