Terry J. Reedy added the comment:
_filename_to_unicode returns unicode names as is. In 3.x, are filenames ever
not unicode? They come from either a file dialog (via tk, hence unicode), or
sys.argv. I do not know about the latter, which is possibly OS-dependent.
This function is used in three places in idlelib, all within EditorWindow:
1. def update_recent_files_list(self, new_file=None): ...
ufile_name = self._filename_to_unicode(file_name)
2. def short_title(self): # reduce filename to basename
return self._filename_to_unicode(filename)
3. def long_title(self):
return self._filename_to_unicode(self.io.filename or "")
The _f2u output is not saved to disk or used to open files; it is display only.
So replacing astral chars with either \Unnnnn escapes or the BMP box char
should be fine.
1. The callback associated with each ufile_name encloses the original
file_name, which is used to open the file. The original filename is also saved
back to disk before the _f2u call.
2&3. The titles are display only. WindowList.py displays the long name for
editor windows, but the callback is a wakeup function tied to the Window itself.
----------
stage: needs patch -> test needed
versions: +Python 3.6
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<http://bugs.python.org/issue23672>
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