Calling PyUnicode_DecodeFSDefault() in C API functions PyErr_SetFromErrnoWithFilename(), PyErr_SetExcFromWindowsErrWithFilename() and PyErr_SetFromWindowsErrWithFilename() can modify the value of errno or the result of GetLastError() which are used in these functions.

Linked PRs

• gh-107916: Save the error code before decoding the filename in PyErr_SetFromErrnoWithFilename() etc #107929
• [3.12] gh-107916: Save the error code before decoding the filename in PyErr_SetFromErrnoWithFilename() etc (GH-107929) #108205
• [3.11] gh-107916: Save the error code before decoding the filename in PyErr_SetFromErrnoWithFilename() etc (GH-107929) #108206