Maildir relative paths change was not complete

Commit e023f190b0 changed the storing of
file paths in the messagelist variable to be relative paths, but we were
using the full absolute path anyway as we missed one spot.

Adapt this and construct the full file path in the one place where we
need it.

Signed-off-by: Sebastian Spaeth <Sebastian@SSpaeth.de>
Signed-off-by: Nicolas Sebrecht <nicolas.s-dev@laposte.net>

offlineimap/folder/Maildir.py

@@ -133,7 +133,7 @@ class MaildirFolder(BaseFolder):
         folderstr = ',FMD5=' + foldermd5
         for dirannex in ['new', 'cur']:
             fulldirname = os.path.join(self.getfullname(), dirannex)
-            files.extend(os.path.join(fulldirname, filename) for
+            files.extend(os.path.join(dirannex, filename) for
                          filename in os.listdir(fulldirname))
         for file in files:
             messagename = os.path.basename(file)
@@ -151,10 +151,9 @@ class MaildirFolder(BaseFolder):
 
             #Check and see if the message is too big if the maxsize for this account is set
             if(maxsize != -1):
-                filesize = os.path.getsize(file)
-                if(filesize > maxsize):
+                size = os.path.getsize(os.path.join(self.getfullname(), file))
+                if(size > maxsize):
                     continue
-            
 
             foldermatch = messagename.find(folderstr) != -1
             if not foldermatch:
@@ -177,6 +176,7 @@ class MaildirFolder(BaseFolder):
                 flags = set(flagmatch.group(1))
             else:
                 flags = set()
+            # 'filename' is 'dirannex/filename', e.g. cur/123_U=1_FMD5=1:2,S
             retval[uid] = {'uid': uid,
                            'flags': flags,
                            'filename': file}