patch 987c7436cd18763a950f5799ef5fac6e7cb127e4
Author: E. Bosch <presidev@AT@gmail.com>
Date:   Mon Dec 18 21:18:42 CET 2023
  * telegram, utils: Replace invalid characters in filenames with number sequences instead of just removing.
  This will prevent some filename collisions in corner cases.
diff -rN -u old-irgramd/utils.py new-irgramd/utils.py
--- old-irgramd/utils.py	2024-11-01 02:29:41.213591232 +0100
+++ new-irgramd/utils.py	2024-11-01 02:29:41.213591232 +0100
@@ -81,7 +81,12 @@
     return messages_limited
 
 def sanitize_filename(fn):
-    return FILENAME_INVALID_CHARS.sub('', fn).strip('-').replace(' ','_')
+    cn = str(sanitize_filename.cn)
+    new_fn, ns = FILENAME_INVALID_CHARS.subn(cn, fn)
+    if ns:
+        sanitize_filename.cn += 1
+    return new_fn.strip('-').replace(' ','_')
+sanitize_filename.cn = 0
 
 def add_filename(filename, add):
     if add: