progress test failure on fedora34

Hi,
The test t0500-progress-display.sh in current master fails on latest 
fedora34.
The break was introduced with:

83ae1edff7ee0b7674bd556955d2cf1706bddb21
ab/fix-columns-to-80-during-tests (2021-06-29) 1 commit

Kind regards,
Fabian


expecting success of 0500.3 'progress display breaks long lines #1':
     sed -e "s/Z$//" >expect <<\EOF &&
Working hard.......2.........3.........4.........5.........6:   0% 
(100/100000)<CR>
Working hard.......2.........3.........4.........5.........6:   1% 
(1000/100000)<CR>
Working hard.......2.........3.........4.........5.........6: Z
    10% (10000/100000)<CR>
   100% (100000/100000)<CR>
   100% (100000/100000), done.
EOF

     cat >in <<-\EOF &&
     progress 100
     progress 1000
     progress 10000
     progress 100000
     EOF
     test-tool progress --total=100000 \
         "Working hard.......2.........3.........4.........5.........6" \
         <in 2>stderr &&

     show_cr <stderr >out &&
     test_cmp expect out

++ sed -e 's/Z$//'
++ cat
++ test-tool progress --total=100000 'Working 
hard.......2.........3.........4.........5.........6'
++ show_cr
++ tr '\015' Q
++ sed -e 's/Q/<CR>\
/g'
++ test_cmp expect out
++ test 2 -ne 2
++ eval 'diff -u' '"$@"'

+++ diff -u expect out
--- expect    2021-07-14 12:29:49.576970165 +0000
+++ out    2021-07-14 12:29:49.580970145 +0000

@@ -1,6 +1,5 @@
  Working hard.......2.........3.........4.........5.........6:   0% 

(100/100000)<CR>
  Working hard.......2.........3.........4.........5.........6:   1% 
(1000/100000)<CR>
-Working hard.......2.........3.........4.........5.........6:
-   10% (10000/100000)<CR>
-  100% (100000/100000)<CR>
-  100% (100000/100000), done.
+Working hard.......2.........3.........4.........5.........6:  10% 
(10000/100000)<CR>
+Working hard.......2.........3.........4.........5.........6: 100% 
(100000/100000)<CR>
+Working hard.......2.........3.........4.........5.........6: 100% 
(100000/100000), done.
error: last command exited with $?=1
not ok 3 - progress display breaks long lines #1
#
#        sed -e "s/Z$//" >expect <<\EOF &&
#    Working hard.......2.........3.........4.........5.........6: 0% 
(100/100000)<CR>
#    Working hard.......2.........3.........4.........5.........6: 1% 
(1000/100000)<CR>
#    Working hard.......2.........3.........4.........5.........6: Z
#       10% (10000/100000)<CR>
#      100% (100000/100000)<CR>
#      100% (100000/100000), done.
#    EOF
#
#        cat >in <<-\EOF &&
#        progress 100
#        progress 1000
#        progress 10000
#        progress 100000
#        EOF
#        test-tool progress --total=100000 \
#            "Working 
hard.......2.........3.........4.........5.........6" \
#            <in 2>stderr &&
#
#        show_cr <stderr >out &&
#        test_cmp expect out
#