fix: #168 TextFrame.fit_text() method crashing on long words

pptx/text/layout.py

@@ -231,11 +231,20 @@ def __eq__(self, other):
 
     def __iter__(self):
         """
-        Generate a (text, remainder) pair for each possible even-word line
+        Generate a (text, remainder) pair for each possible line
         break in this line source, where *text* is a str value and remainder
-        is a |_LineSource| value.
+        is a |_LineSource| value. Line breaks are possible between each word
+        or between characters of the first word.
         """
+
         words = self._text.split()
+        first_word = words[0]
+        # If the first word is long, we can linebreak in the middle of it
+        for idx in range(1, len(first_word)):
+            line_text = first_word[:idx]
+            remainder_text = ' '.join([first_word[idx:]] + words[1:])
+            remainder = _LineSource(remainder_text)
+            yield _Line(line_text, remainder)
         for idx in range(1, len(words)+1):
             line_text = ' '.join(words[:idx])
             remainder_text = ' '.join(words[idx:])

tests/text/test_layout.py

@@ -267,6 +267,8 @@ class Describe_LineSource(object):
     def it_generates_text_remainder_pairs(self):
         line_source = _LineSource('foo bar baz')
         expected = (
+            ('f',           _LineSource('oo bar baz')),
+            ('fo',          _LineSource('o bar baz')),
             ('foo',         _LineSource('bar baz')),
             ('foo bar',     _LineSource('baz')),
             ('foo bar baz', _LineSource('')),