TZUTC: -0800
MSGID: 54144.syncprog@1:103/705 2dcd8784
PID: Synchronet 3.21b-Linux master/177a369d2 Jan 04 2026 GCC 12.2.0
TID: SBBSecho 3.34-Linux master/6efa906bd Jan 13 2026 GCC 12.2.0
BBSID: VERT
CHRS: ASCII 1
FORMAT: flowed
https://gitlab.synchro.net/main/sbbs/-/commit/b1cf73e322081c643f394401
Modified Files:
	src/sbbs3/scfg/scfgxfr2.c
Log Message:
Better raw directory/listing import de-duplication of short names

... and when there is a duplicate we can't de-duplicate (given the current
permutation function anyway), display a more helpful dialog message
("Duplicate dir name") unique from the duplicate internal code error dialog,
so if it's ever a problem again we can distiguish the two different causes.

This fixes issue #820

Other fixes:
- Don't increment the number of dirs imported before the opportunity to abort
  import (upon dupe) is given - which could result in an invalid number of dirs
  imported/added
- Don't import/add more dirs than the number of options that can be displayed
  (100000 currently)
- Use isdir() to check if the path is a directory (not fexistcase) and only
  do this check if the default directory for the lib has "Check for file
  existence" enabled (the default)
- Give the opportunity to contnue or abort the import upon the
  "Not a directory" error/dialog.
- When deriving dir (short) name from a path, skip non-alphanumeric chars
  If none can be found (in the last 25 chars of the path), use the first 25
  chars of the path instead.
- Unrelated fix: a newly created lib's 'vdir' member wasn't initialized
  resulting in the directory's Virtual File Path starting with "//" until the
  config was reloaded.
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