Fix cmdline_row computation

[matveyt]

Fixes #8170

[codecov]

Codecov Report

Merging #8184 (8278309) into master (261417b) will decrease coverage by 0.40%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #8184      +/-   ##
==========================================
- Coverage   89.35%   88.95%   -0.41%     
==========================================
  Files         148      148              
  Lines      166709   165192    -1517     
==========================================
- Hits       148966   146949    -2017     
- Misses      17743    18243     +500     

Flag	Coverage Δ
huge-clang-none	87.76% <ø> (-0.82%)	⬇️
huge-gcc-none	88.81% <ø> (-0.01%)	⬇️
huge-gcc-testgui	?
huge-gcc-unittests	2.46% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/gui_gtk_x11.c	57.17% <0.00%> (-5.60%)	⬇️
src/highlight.c	86.42% <0.00%> (-4.05%)	⬇️
src/ui.c	78.40% <0.00%> (-3.47%)	⬇️
src/gui_gtk.c	27.70% <0.00%> (-3.39%)	⬇️
src/buffer.c	89.36% <0.00%> (-2.83%)	⬇️
src/gui.c	59.53% <0.00%> (-2.77%)	⬇️
src/os_unix.c	69.30% <0.00%> (-2.31%)	⬇️
src/gui_xim.c	22.00% <0.00%> (-1.75%)	⬇️
src/hardcopy.c	86.15% <0.00%> (-1.62%)	⬇️
src/filepath.c	88.43% <0.00%> (-1.54%)	⬇️
... and 78 more

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