Rich spinning forever in _split_cells

[gatesn]

See tconbeer/harlequin#659
Started as of: Textualize/rich#3521

Somehow, the _split_cells function is passed a negative value for cut and it sits in an infinite loop.

I don't really understand what this function is doing, but this patch worked well for me!

@@ -122,11 +122,11 @@
             A tuple of two segments.
         """
         text, style, control = segment
         _Segment = Segment
         cell_length = segment.cell_length
-        if cut >= cell_length:
+        if cut < 0 or cut >= cell_length:
             return segment, _Segment("", style, control)

         cell_size = get_character_cell_size

         pos = int((cut / cell_length) * len(text))

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[gatesn]

Apologies, wrong project: Textualize/rich#3532

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