[LyX/master] Fix #13288

commit abaf03b71734400a6764f3899788197dc116775a
Author: Juergen Spitzmueller <[email protected]>
Date:   Tue Mar 10 16:58:13 2026 +0100

    Fix #13288
---
 lib/lyx2lyx/lyx_2_6.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/lib/lyx2lyx/lyx_2_6.py b/lib/lyx2lyx/lyx_2_6.py
index 99785454fc..9c9b52699c 100644
--- a/lib/lyx2lyx/lyx_2_6.py
+++ b/lib/lyx2lyx/lyx_2_6.py
@@ -313,6 +313,12 @@ def revert_mathref(document):
                         if k == -1 or l == j:
                             i = j
                             break
+                        m = regexp.match(document.body[k])
+                        if m:
+                            pretext = m.group(1)
+                            cmd = m.group(2)
+                            arg = m.group(3)
+                            posttext = m.group(4)
 
             arguments = arg[1:-1].split(",")
             
-- 
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