From 174dc2c8be3c0098e28bf5676819c7ca1c65d74f Mon Sep 17 00:00:00 2001
From: Jean-Marc Lasgouttes <lasgouttes@lyx.org>
Date: Thu, 12 Oct 2023 11:09:46 +0200
Subject: [PATCH] Use Color_selectionmath as needed for multi-cell selection in
 math

This is complementary to partial selection implemented at 65cb9fa4.
---
 src/mathed/MathData.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/src/mathed/MathData.cpp b/src/mathed/MathData.cpp
index eee53d2f50..24b4d86fb9 100644
--- a/src/mathed/MathData.cpp
+++ b/src/mathed/MathData.cpp
@@ -239,6 +239,18 @@ bool MathData::addToMathRow(MathRow & mrow, MetricsInfo & mi) const
 		if (s1.idx() == s2.idx() && &inset->cell(s1.idx()) == this) {
 			bspos = s1.pos();
 			espos = s2.pos();
+		} else if (s1.idx() != s2.idx()) {
+			// search for this math data and check whether it is selected
+			for (idx_type idx = 0; idx < inset->nargs(); ++idx) {
+				MathData const & c = inset->cell(idx);
+				if (&c == this && inset->idxBetween(idx, s1.idx(), s2.idx())) {
+					// whole cell is selected
+					bspos = 0;
+					espos = size();
+					// no need to continue searchning
+					break;
+				}
+			}
 		}
 	}