> Fortunately, now we have customizable icons.  So I tried to do this
> with a patch like below, but compilation failed with this error
> because tab-bar.el is pre-loaded:
>
>   Loading tab-bar (native compiled elisp)...
>   Error: void-function (icons--register)
>   (require cl-print) while preparing to dump
>

OTOH, the following patch works pretty well: