Clarify that normalise does not remove '..'

Fixes #86

Author: hasufell

System/FilePath/Internal.hs

@@ -835,10 +835,13 @@ makeRelative root path
 --
 -- * .\/ -> \"\"
 --
+-- Does not remove @".."@, because of symlinks.
+--
 -- > Posix:   normalise "/file/\\test////" == "/file/\\test/"
 -- > Posix:   normalise "/file/./test" == "/file/test"
 -- > Posix:   normalise "/test/file/../bob/fred/" == "/test/file/../bob/fred/"
 -- > Posix:   normalise "../bob/fred/" == "../bob/fred/"
+-- > Posix:   normalise "/a/../c" == "/a/../c"
 -- > Posix:   normalise "./bob/fred/" == "bob/fred/"
 -- > Windows: normalise "c:\\file/bob\\" == "C:\\file\\bob\\"
 -- > Windows: normalise "c:\\" == "C:\\"

System/FilePath/Posix.hs

@@ -835,10 +835,13 @@ makeRelative root path
 --
 -- * .\/ -> \"\"
 --
+-- Does not remove @".."@, because of symlinks.
+--
 -- > Posix:   normalise "/file/\\test////" == "/file/\\test/"
 -- > Posix:   normalise "/file/./test" == "/file/test"
 -- > Posix:   normalise "/test/file/../bob/fred/" == "/test/file/../bob/fred/"
 -- > Posix:   normalise "../bob/fred/" == "../bob/fred/"
+-- > Posix:   normalise "/a/../c" == "/a/../c"
 -- > Posix:   normalise "./bob/fred/" == "bob/fred/"
 -- > Windows: normalise "c:\\file/bob\\" == "C:\\file\\bob\\"
 -- > Windows: normalise "c:\\" == "C:\\"

System/FilePath/Windows.hs

@@ -835,10 +835,13 @@ makeRelative root path
 --
 -- * .\/ -> \"\"
 --
+-- Does not remove @".."@, because of symlinks.
+--
 -- > Posix:   normalise "/file/\\test////" == "/file/\\test/"
 -- > Posix:   normalise "/file/./test" == "/file/test"
 -- > Posix:   normalise "/test/file/../bob/fred/" == "/test/file/../bob/fred/"
 -- > Posix:   normalise "../bob/fred/" == "../bob/fred/"
+-- > Posix:   normalise "/a/../c" == "/a/../c"
 -- > Posix:   normalise "./bob/fred/" == "bob/fred/"
 -- > Windows: normalise "c:\\file/bob\\" == "C:\\file\\bob\\"
 -- > Windows: normalise "c:\\" == "C:\\"

tests/TestGen.hs

@@ -388,6 +388,7 @@ tests =
     ,("P.normalise \"/file/./test\" == \"/file/test\"", property $ P.normalise "/file/./test" == "/file/test")
     ,("P.normalise \"/test/file/../bob/fred/\" == \"/test/file/../bob/fred/\"", property $ P.normalise "/test/file/../bob/fred/" == "/test/file/../bob/fred/")
     ,("P.normalise \"../bob/fred/\" == \"../bob/fred/\"", property $ P.normalise "../bob/fred/" == "../bob/fred/")
+    ,("P.normalise \"/a/../c\" == \"/a/../c\"", property $ P.normalise "/a/../c" == "/a/../c")
     ,("P.normalise \"./bob/fred/\" == \"bob/fred/\"", property $ P.normalise "./bob/fred/" == "bob/fred/")
     ,("W.normalise \"c:\\\\file/bob\\\\\" == \"C:\\\\file\\\\bob\\\\\"", property $ W.normalise "c:\\file/bob\\" == "C:\\file\\bob\\")
     ,("W.normalise \"c:\\\\\" == \"C:\\\\\"", property $ W.normalise "c:\\" == "C:\\")