Context sentence properly cut off at newline

The newline character is taken into account 20 lines earlier when
looking for the start of the segment, but not when looking for its end.
When lines don’t end in punctuation (e. g. notes taken in lectures),
this could result in excessively long {sentence} fields.


Former-commit-id: 8e25d2d2b7212c23e1a67c96055943c53aca4b36

yomi_base/reader_util.py

@@ -70,7 +70,7 @@ def findSentence(content, position):
             if c in terminators:
                 end = i + 1
                 break
-            elif c in quotesBwd:
+            elif (c in quotesBwd or c == '\n'):
                 end = i
                 break