fix issue splitting segments

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [13.0.1] - 2022-01-06
+
+### Fixed
+
+- Fixed issue with Segment.split_cells for mixed single and double cell widths
+
 ## [13.0.0] - 2022-12-30
 
 ### Fixed

rich/segment.py

@@ -119,7 +119,7 @@ class Segment(NamedTuple):
 
         cell_size = get_character_cell_size
 
-        pos = int((cut / cell_length) * len(text))
+        pos = int((cut / cell_length) * (len(text) - 1))
 
         before = text[:pos]
         cell_pos = cell_len(before)

tests/test_segment.py

@@ -273,6 +273,11 @@ def test_divide_edge_2():
         ("💩X💩Y💩Z💩A💩", 4, (Segment("💩X "), Segment(" Y💩Z💩A💩"))),
         ("XYZABC", 4, (Segment("XYZA"), Segment("BC"))),
         ("XYZABC", 5, (Segment("XYZAB"), Segment("C"))),
+        (
+            "a1あ１１bcdaef",
+            9,
+            (Segment("a1あ１１b"), Segment("cdaef")),
+        ),
     ],
 )
 def test_split_cells_emoji(text, split, result):