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Author: kovidgoyal

gen/wcwidth.py

@@ -781,7 +781,7 @@ def add_to_current_cell(self, p: GraphemeSegmentationProps) -> 'GraphemeSegmenta
             ):
                 add_to_cell = True
             # No break before: extending characters or ZWJ (GB9), SpacingMarks (GB9a), Prepend characters (GB9b).
-            elif prop in ('Extend', 'ZWJ', 'SpacingMark') or prev in 'Prepend':
+            elif prop in ('Extend', 'ZWJ', 'SpacingMark') or prev == 'Prepend':
                 add_to_cell = True
             # No break within certain combinations of Indic_Conjunct_Break values
             # Between consonant {extend|linker}* linker {extend|linker}* and consonant (GB9c).