From 1c2628b5de383724daa8a203ad3878044a5eb304 Mon Sep 17 00:00:00 2001
From: Juergen Spitzmueller <spitz@lyx.org>
Date: Sun, 6 Mar 2022 17:27:28 +0100
Subject: [PATCH] Do not try to access user_defined_bullet with nesting > 3

We only have 4 nesting labels available.

In the workarea, display a fallback label with deeper nesting.
---
 src/Buffer.cpp     | 5 ++++-
 src/RowPainter.cpp | 2 +-
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/Buffer.cpp b/src/Buffer.cpp
index 54272a79d5..5295a4bfc5 100644
--- a/src/Buffer.cpp
+++ b/src/Buffer.cpp
@@ -5158,7 +5158,10 @@ void Buffer::Impl::setLabel(ParIterator & it, UpdateType utype) const
 	switch(layout.labeltype) {
 	case LABEL_ITEMIZE: {
 		par.params().labelString(
-			bp.user_defined_bullet(par.itemdepth).getLabel());
+			(par.itemdepth < 4)
+					? bp.user_defined_bullet(par.itemdepth).getLabel()
+					  // Display fallback for too deeply nested items
+					: bformat(from_ascii("[?%1$d]"), int(par.itemdepth + 1)));
 		break;
 	}
 
diff --git a/src/RowPainter.cpp b/src/RowPainter.cpp
index 84848ec05a..4f5593e18b 100644
--- a/src/RowPainter.cpp
+++ b/src/RowPainter.cpp
@@ -434,7 +434,7 @@ void RowPainter::paintLabel() const
 	FontInfo lfont = font;
 
 	// bullet?
-	if (layout.labeltype == LABEL_ITEMIZE) {
+	if (layout.labeltype == LABEL_ITEMIZE && par_.itemdepth < 4) {
 		// get label font size from document properties
 		lfont.setSize(pi_.base.bv->buffer().params().user_defined_bullet(par_.itemdepth).getFontSize());
 		// realize to avoid assertion
-- 
2.39.5