fix quickcheck test on windows

prop_relPathDirToFileAbs_basics (TestableFilePath ":/") failed on
windows. The colon was filtered out after trying to make
the path relative, which only removed leading path separators.
So, ":/" changed to "/" which is not relative. Filtering out the colon
before hand avoids this problem.

Sponsored-by: Luke Shumaker on Patreon

Utility/Path/Tests.hs

@@ -49,7 +49,8 @@ prop_relPathDirToFileAbs_basics pt = and
 	p = pathSeparator `B.cons` relf
 	-- Make the input a relative path. On windows, make sure it does
 	-- not contain anything that looks like a drive letter.
-	relf = B.filter (not . skipchar) $ B.dropWhile isPathSeparator $
+	relf = B.dropWhile isPathSeparator $
+		B.filter (not . skipchar) $
 		toRawFilePath (fromTestableFilePath pt)
 	skipchar b = b == (fromIntegral (ord ':'))
 

doc/bugs/test_prop__95__relPathDirToFileAbs__95__basics_fails_again.mdwn

@@ -51,3 +51,5 @@ Windows 10 version 21H2 (build 19044.1586), 64 bit.
 Git Annex is great. I use it several times a week with my multigigabyte backups, where it gives structure to my image-based backup routines, so you could say I'm a believer. :)
 
 [[!meta author=jkniiv]]
+
+> [[fixed|done]] --[[Joey]]