After my last message I was thinking that anyone coming here might be a little bit lost reading this thread (indeed, my fault).

Relevant points:

- At this time, this is the latest patch to improve icomplete-vertical: https://debbugs.gnu.org/cgi/bugreport.cgi?att=1;filename=0001-Enhance-icomplete-vertical-mode.patch;msg=34;bug=75794

- This is a video demo: https://www.youtube.com/watch?v=ni0l6PruJEs

- (new) With the patch applied, eval this file after `emacs -Q` and test M-x and in-buffer completion (binded to Tab): https://0x0.st/8ua3.el

Attached, some thumbs on default theme and wombat, for comparison.
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Thanks,
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Rahul Martim Juliato