Issue #29094: Offsets in a ZIP file created with extern file object and modes

"w" and "x" now are relative to the start of the file.

diff --cc Lib/zipfile.py
Simple merge

diff --cc Misc/NEWS
index b1b3c69681ed73a9efca86bb7ef12ed5cde1cdda,ad67b1da62e63dc600843ca68e797b5a74413b50..a8d4ee8d21df73c8cad8ac54eb850c9921da6f60
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -40,14 -140,9 +40,17 @@@ Core and Builtin
  Library
  -------
  
+ - Issue #29094: Offsets in a ZIP file created with extern file object and modes
+   "w" and "x" now are relative to the start of the file.
+ 
 +- Issue #29085: Allow random.Random.seed() to use high quality OS randomness
 +  rather than the pid and time.
 +
 +- Issue #29061: Fixed bug in secrets.randbelow() which would hang when given
 +  a negative input.  Patch by Brendan Donegan.
 +
 +- Issue #29079: Prevent infinite loop in pathlib.resolve() on Windows
 +
  - Issue #13051: Fixed recursion errors in large or resized
    curses.textpad.Textbox.  Based on patch by Tycho Andersen.