From 3da25187a91477a83bf2d1321334f345104d0788 Mon Sep 17 00:00:00 2001
From: Juergen Spitzmueller <spitz@lyx.org>
Date: Tue, 14 May 2019 14:05:46 +0200
Subject: [PATCH] Prevent assert due to some odd role in older qt versions.

---
 src/frontends/qt4/GuiIdListModel.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/frontends/qt4/GuiIdListModel.cpp b/src/frontends/qt4/GuiIdListModel.cpp
index b1db347327..d38a087f7c 100644
--- a/src/frontends/qt4/GuiIdListModel.cpp
+++ b/src/frontends/qt4/GuiIdListModel.cpp
@@ -66,6 +66,10 @@ bool GuiIdListModel::setData(QModelIndex const & index,
 	if (role == Qt::DecorationRole)
 		// nothing to do
 		return true;
+	if (role == Qt::UserRole - 1)
+		// This role is set by Qt <= 5.5 if setEditable()
+		// of the item is false
+		return true;
 	// If we assert here, it's because we're trying to set an
 	// unrecognized role.
 	LATTEST(false);