[LyX/master] Fix change tracking glitch (#12912)

[Juergen Spitzmueller]

commit d9af7a0fff143b23ee60ddfe8c70456462831685
Author: Juergen Spitzmueller <spitz at lyx.org>
Date:   Sat Sep 16 13:31:00 2023 +0200

    Fix change tracking glitch (#12912)
---
 src/Text.cpp |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/src/Text.cpp b/src/Text.cpp
index e8fd9d4..ef5dd26 100644
--- a/src/Text.cpp
+++ b/src/Text.cpp
@@ -3634,12 +3634,11 @@ bool doInsertInset(Cursor & cur, Text * text,
 			cutSelectionToTemp(cur, pastesel);
 			/* Move layout information inside the inset if the whole
 			 * paragraph and the inset allows setting layout
-			 * FIXME: this does not work as expected when change tracking is on
-			 *   However, we do not really know what to do in this case.
 			 * FIXME: figure out a good test in the environment case (see #12251).
 			 */
 			if (cur.paragraph().layout().isCommand()
-			     && cur.paragraph().empty()
+			     && (cur.paragraph().empty()
+				 || cur.paragraph().isDeleted(0, cur.paragraph().size()))
 			     && !inset->forcePlainLayout()) {
 				cur.paragraph().setPlainOrDefaultLayout(bparams.documentClass());
 				move_layout = true;