From 33794de82b5c3d9e7cdd078bcc5bc7494ee842a5 Mon Sep 17 00:00:00 2001
From: Jean-Marc Lasgouttes <lasgouttes@lyx.org>
Date: Wed, 7 Nov 2018 11:53:00 -1000
Subject: [PATCH] Fixup 097da3a9: fix horizontal navigatiion in InsetMathRoot

Exchanging cells 0 and 1 requires to implement idxBackWard/Forward.
---
 src/mathed/InsetMathRoot.cpp | 24 ++++++++++++++++++++++++
 src/mathed/InsetMathRoot.h   |  4 ++++
 2 files changed, 28 insertions(+)

diff --git a/src/mathed/InsetMathRoot.cpp b/src/mathed/InsetMathRoot.cpp
index b3723faca8..565951114e 100644
--- a/src/mathed/InsetMathRoot.cpp
+++ b/src/mathed/InsetMathRoot.cpp
@@ -156,6 +156,30 @@ bool InsetMathRoot::idxUpDown(Cursor & cur, bool up) const
 }
 
 
+bool InsetMathRoot::idxForward(Cursor & cur) const
+{
+	// nucleus is 0 and is on the right
+	if (cur.idx() == 0)
+		return false;
+	else
+		cur.idx() = 0;
+
+	return true;
+}
+
+
+bool InsetMathRoot::idxBackward(Cursor & cur) const
+{
+	// nucleus is 0 and is on the right
+	if (cur.idx() == 1)
+		return false;
+	else
+		cur.idx() = 1;
+
+	return true;
+}
+
+
 void InsetMathRoot::maple(MapleStream & os) const
 {
 	os << '(' << cell(0) << ")^(1/(" << cell(1) <<"))";
diff --git a/src/mathed/InsetMathRoot.h b/src/mathed/InsetMathRoot.h
index 63c35b6425..d9e92c07be 100644
--- a/src/mathed/InsetMathRoot.h
+++ b/src/mathed/InsetMathRoot.h
@@ -26,6 +26,10 @@ public:
 	InsetMathRoot(Buffer * buf);
 	///
 	bool idxUpDown(Cursor & cur, bool up) const;
+	///
+	bool idxForward(Cursor & cur) const;
+	///
+	bool idxBackward(Cursor & cur) const;
 
 	///
 	void metrics(MetricsInfo & mi, Dimension & dim) const;
-- 
2.39.5