fix for markup span sorting

[willmcgugan]

Fixes #1334

[codecov]

Codecov Report

Merging #1335 (b671b34) into master (0035fb0) will increase coverage by 0.29%.
The diff coverage is 99.59%.

@@            Coverage Diff             @@
##           master    #1335      +/-   ##
==========================================
+ Coverage   99.49%   99.78%   +0.29%     
==========================================
  Files          59       70      +11     
  Lines        5101     6627    +1526     
==========================================
+ Hits         5075     6613    +1538     
+ Misses         26       14      -12     

Flag	Coverage Δ
unittests	99.78% <99.59%> (+0.29%)	⬆️

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Impacted Files	Coverage Δ
rich/ansi.py	100.00% <ø> (ø)
rich/color_triplet.py	100.00% <ø> (ø)
rich/columns.py	100.00% <ø> (ø)
rich/default_styles.py	100.00% <ø> (ø)
rich/highlighter.py	100.00% <ø> (ø)
rich/rule.py	100.00% <ø> (ø)
rich/progress.py	97.81% <96.92%> (+2.38%)	⬆️
rich/repr.py	98.11% <98.11%> (ø)
rich/text.py	99.80% <98.46%> (-0.20%)	⬇️
rich/segment.py	99.25% <98.65%> (-0.75%)	⬇️
... and 61 more

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