[LyX/master] Bring back db_stdsections.inc

[Juergen Spitzmueller]

commit 81767de9be16d6b3afd83c7642b09adeba28eea7
Author: Juergen Spitzmueller <spitz at lyx.org>
Date:   Tue Feb 24 08:14:36 2026 +0100

    Bring back db_stdsections.inc
    
    Otherwise we have undefined layouts (see make check)
---
 lib/layouts/db_stdclass.inc    | 2 +-
 lib/layouts/db_stdsections.inc | 8 ++++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/lib/layouts/db_stdclass.inc b/lib/layouts/db_stdclass.inc
index 5cea9e9ef9..107b6c3114 100644
--- a/lib/layouts/db_stdclass.inc
+++ b/lib/layouts/db_stdclass.inc
@@ -28,7 +28,7 @@ End
 Input stdinsets.inc
 Input db_stdcharstyles.inc
 # Input db_stdlists.inc
-# Input db_stdsections.inc
+Input db_stdsections.inc
 Input db_stdstarsections.inc
 Input db_stdtitle.inc
 Input db_stdstruct.inc
diff --git a/lib/layouts/db_stdsections.inc b/lib/layouts/db_stdsections.inc
new file mode 100644
index 0000000000..748b698fca
--- /dev/null
+++ b/lib/layouts/db_stdsections.inc
@@ -0,0 +1,8 @@
+# Standard textclass definition file. Taken from initial LyX source code
+# Author : Matthias Ettrich <ettrich at informatik.uni-tuebingen.de>
+# Transposed by Pascal André <andre at via.ecp.fr>
+# Heavily modifed and enhanced by several developers.
+
+
+Format 115
+Input stdsections.inc