#1555570: correctly handle a \r\n that is split by the read buffer.

Patch and test by Tony Nelson.
diff --git a/Lib/email/feedparser.py b/Lib/email/feedparser.py
index a6853c2..8db70b3 100644
--- a/Lib/email/feedparser.py
+++ b/Lib/email/feedparser.py
@@ -104,6 +104,10 @@
         # data after the final RE.  In the case of a NL/CR terminated string,
         # this is the empty string.
         self._partial = parts.pop()
+        #GAN 29Mar09  bugs 1555570, 1721862  Confusion at 8K boundary ending with \r:
+        # is there a \n to follow later?
+        if not self._partial and parts and parts[-1].endswith('\r'):
+            self._partial = parts.pop(-2)+parts.pop()
         # parts is a list of strings, alternating between the line contents
         # and the eol character(s).  Gather up a list of lines after
         # re-attaching the newlines.