diff --git a/src/Row.cpp b/src/Row.cpp
index d074d73eb8..d7940e92e9 100644
--- a/src/Row.cpp
+++ b/src/Row.cpp
@@ -36,17 +36,23 @@ using frontend::FontMetrics;
 
 double Row::Element::pos2x(pos_type const i) const
 {
+	LASSERT(i >= pos && i <= endpos, return 0);
+
 	bool const rtl = font.isVisibleRightToLeft();
 
-	// handle first the two bounds of the element
-	if ((!rtl && pos >= i) || (rtl && endpos <= i))
-		return 0;
-	if ((!rtl && endpos <= i) || (rtl && pos >= i))
-		return width();
+	int w = 0;
+	//handle first the two bounds of the element
+	if (i == pos)
+		w = 0;
+	else if (i == endpos)
+		w = width();
+	else {
+		LASSERT(type == STRING, return 0);
+		FontMetrics const & fm = theFontMetrics(font);
+		// FIXME Avoid caching of metrics there?
+		w = fm.width(str.substr(0, i - pos));
+	}
 
-	FontMetrics const & fm = theFontMetrics(font);
-	// FIXME Avoid caching of metrics there?
-	int const w = fm.width(str.substr(0, i - pos));
 	if (rtl)
 		return width() - w;
 	else
diff --git a/src/TextMetrics.cpp b/src/TextMetrics.cpp
index 8563975585..b8941335bd 100644
--- a/src/TextMetrics.cpp
+++ b/src/TextMetrics.cpp
@@ -1613,15 +1613,16 @@ int TextMetrics::cursorX(CursorSlice const & sl,
 	double x = row.x;
 
 	/**
-	 * When boundary is true, position is on the row element (pos, endpos)
+	 * When boundary is true, position i is in the row element (pos, endpos)
 	 * if
-	 *    pos < pos <= endpos
+	 *    pos < i <= endpos
 	 * whereas, when boundary is false, the test is
-	 *    pos <= pos < endpos
+	 *    pos <= i < endpos
 	 * The correction below allows to handle both cases.
 	*/
 	int const boundary_corr = (boundary && pos) ? -1 : 0;
 
+	//?????
 	if (row.empty()
 	    || (row.begin()->font.isVisibleRightToLeft()
 		&& pos == row.begin()->endpos))