[LyX/2.4.x] Fix bug #12934

[Richard Kimberly Heck]

commit c97375e46d15ab3c9b864b2ebcae821c0b3b09d8
Author: Richard Kimberly Heck <rikiheck at lyx.org>
Date:   Sat Jun 1 13:05:12 2024 -0400

    Fix bug #12934
    
    (cherry picked from commit 6484dce51b46f8fc0134a7532efb08401bba3c53)
---
 src/Buffer.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/Buffer.cpp b/src/Buffer.cpp
index 38d236964a..994d5476d5 100644
--- a/src/Buffer.cpp
+++ b/src/Buffer.cpp
@@ -5238,8 +5238,7 @@ void Buffer::Impl::setLabel(ParIterator & it, UpdateType utype) const
 	par.itemdepth = getItemDepth(it);
 
 	if (layout.margintype == MARGIN_MANUAL) {
-		if (par.params().labelWidthString().empty())
-			par.params().labelWidthString(par.expandLabel(layout, bp));
+		// nothing to do: empty label width string is fine.
 	} else if (layout.latextype == LATEX_BIB_ENVIRONMENT) {
 		// we do not need to do anything here, since the empty case is
 		// handled during export.