From 3d0dd488c3b2ab6426431b840624d5721ac32105 Mon Sep 17 00:00:00 2001
From: Juergen Spitzmueller <spitz@lyx.org>
Date: Sat, 4 Apr 2020 09:27:24 +0200
Subject: [PATCH] Disable append-column with gathered

Fixes #11812

(cherry picked from commit ed137ee435ea2e9e1d38b6095e8ce51c0c48204a)
---
 src/mathed/InsetMathSplit.cpp | 6 ++++++
 status.23x                    | 3 +++
 2 files changed, 9 insertions(+)

diff --git a/src/mathed/InsetMathSplit.cpp b/src/mathed/InsetMathSplit.cpp
index ebc8162dd9..31314b3f84 100644
--- a/src/mathed/InsetMathSplit.cpp
+++ b/src/mathed/InsetMathSplit.cpp
@@ -116,6 +116,12 @@ bool InsetMathSplit::getStatus(Cursor & cur, FuncRequest const & cmd,
 	switch (cmd.action()) {
 	case LFUN_TABULAR_FEATURE: {
 		string s = cmd.getArg(0);
+		if (s == "append-column"
+		    && (name_ == "gathered" || name_ == "lgathered" || name_ == "rgathered")) {
+			// gathered does not support multiple columns
+			flag.setEnabled(false);
+			return true;
+		}
 		if (s == "add-vline-left" || s == "add-vline-right") {
 			flag.message(bformat(
 				from_utf8(N_("Can't add vertical grid lines in '%1$s'")),
diff --git a/status.23x b/status.23x
index 050d93bdc1..59b3f06eb6 100644
--- a/status.23x
+++ b/status.23x
@@ -88,6 +88,9 @@ What's new
 
 - Avoid bleeding of inset background outside of inset (bug 11786).
 
+- Disallow adding columns with gathered environment as this is not
+  supported (bug 11812).
+
 
 * INTERNALS