commit f7afcc31feaff19fcc97ffe45453e450218ae31d
Author: Jean-Marc Lasgouttes <lasgout...@lyx.org>
Date:   Fri Apr 21 14:42:51 2023 +0200

    Fix undo with cell-plit
    
    This function modifies several cells.
    
    Fixes bug #12746.
---
 src/mathed/InsetMathGrid.cpp |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/src/mathed/InsetMathGrid.cpp b/src/mathed/InsetMathGrid.cpp
index 65cd662..3adec0c 100644
--- a/src/mathed/InsetMathGrid.cpp
+++ b/src/mathed/InsetMathGrid.cpp
@@ -1413,7 +1413,8 @@ void InsetMathGrid::doDispatch(Cursor & cur, FuncRequest 
& cmd)
                break;
 
        case LFUN_CELL_SPLIT:
-               cur.recordUndo();
+               // undo needs to cover two cells
+               cur.recordUndoInset();
                splitCell(cur);
                break;
 
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