[LyX/master] Use correct cursor when creating undo group

[Jean-Marc Lasgouttes]

commit d27f309905049a323ba2704559099b1f9bfd4756
Author: Jean-Marc Lasgouttes <lasgouttes at lyx.org>
Date:   Tue Aug 29 17:23:22 2023 +0200

    Use correct cursor when creating undo group
    
    This affects where cursor will be after undo. In this case, we want
    obviously the 'old' cursor.
    
    Fixes bug #12874.
---
 src/BufferView.cpp |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/BufferView.cpp b/src/BufferView.cpp
index 28577f2..9ec5df3 100644
--- a/src/BufferView.cpp
+++ b/src/BufferView.cpp
@@ -2651,7 +2651,7 @@ void BufferView::mouseEventDispatch(FuncRequest const & cmd0)
 	// Put anchor at the same position.
 	cur.resetAnchor();
 
-	cur.beginUndoGroup();
+	old.beginUndoGroup();
 
 	// Try to dispatch to an non-editable inset near this position
 	// via the temp cursor. If the inset wishes to change the real
@@ -2673,7 +2673,7 @@ void BufferView::mouseEventDispatch(FuncRequest const & cmd0)
 			cursor().fixIfBroken();
 	}
 
-	cur.endUndoGroup();
+	old.endUndoGroup();
 
 	// Do we have a selection?
 	theSelection().haveSelection(cursor().selection());