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[poy <311818@xxxxxxxxxxxxxxxxxx>]

implemented renaming in rev 3156.

because hashed files were previously stored in lower case, i had to
upgrade the hashing version to 3. version 2 trees will be imported when
upgrading to version 3, but not the file registry.

renaming should occur in the following situations:
- duplicates caused by directory merging.
- files that share the same name in a case-insensitive context but that are actually different in a case-sensitive context.

todo:
- directories that share the same name in a case-insensitive context but that are actually different in a case-sensitive context. this may have to be more contrived than file renaming; hopefully it's a less common situation...

it hasn't been well tested, so various share operations might break. i
have been testing on Windows, on which support for a case-sensitive file
system is minimal; feedback from Linux devs is very welcome to see how
this can be improved.

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https://bugs.launchpad.net/bugs/311818

Title:
  case-sensitivity in Unix systems

Status in DC++:
  In Progress
Status in Linux DC++:
  Confirmed

Bug description:
  Unix systems have case-sensitive file-systems. The core however converts all file and directory-names to lower case. Which gives problems if files are shared with the same text and different cases. 
  example:
  In the share there's a file fubar.txt and a file Fubar.txt. Then these two files will be hashed every time dc is started.

  I don't know why all filenames are converted to lower case for
  Windows, but for other OS's it's not wanted. So I've added a possible
  fix which checks for OS.

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