bug#59311: 29.0.50; tab-bar global-mode-string affected by global-display-line-numbers

[Juri Linkov]

>> @@ -322,6 +322,8 @@ string-pixel-width
>>      (with-current-buffer (get-buffer-create " *string-pixel-width*")
>> +      (when display-line-numbers-mode
>> +        (display-line-numbers-mode -1))
>>        (delete-region (point-min) (point-max))
>>        (insert string)
>>        (car (buffer-text-pixel-size nil nil t)))))
>
> Yes.  Or subtract what (line-number-display-width t) returns (it will
> return zero when line-numbers are turned OFF).

Shouldn't then buffer-text-pixel-size subtract line-number-display-width?
Isn't this the responsibility of buffer-text-pixel-size,
not responsibility of a caller like string-pixel-width?