[gtkmm-documentation: 1/2] Sort input file list

[Kjell Ahlstedt <kjellahl src gnome org>]

commit 6af096eb4bcdd874e089717574284b41f757d4c5
Author: Bernhard M. Wiedemann <bwiedemann suse de>
Date:   Wed May 4 16:48:15 2022 +0200

    Sort input file list
    
    so that `gtkmm-tutorial/index.docbook` builds in a reproducible way
    in spite of indeterministic filesystem readdir order
    and http://bugs.python.org/issue30461
    
    This PR was done while working on reproducible builds for openSUSE.

 docs/tutorial/insert_example_code.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/docs/tutorial/insert_example_code.py b/docs/tutorial/insert_example_code.py
index bba1193..e515d55 100755
--- a/docs/tutorial/insert_example_code.py
+++ b/docs/tutorial/insert_example_code.py
@@ -62,8 +62,8 @@ def insert_example_code(examples_base_dir, input_xml_files, output_xml_file):
 
             # List all the source files in the examples directory.
             source_directory = os.path.join(examples_base_dir, source_include_match.group(1))
-            for source_filename in glob.glob(os.path.join(source_directory, '*.h')) + \
-                                   glob.glob(os.path.join(source_directory, '*.cc')):
+            for source_filename in sorted(glob.glob(os.path.join(source_directory, '*.h'))) + \
+                                   sorted(glob.glob(os.path.join(source_directory, '*.cc'))):
               source_basename = os.path.basename(source_filename)
               process_source_file(source_directory, source_basename, outfile, True)