I guess it's too late for that now, but this is still an issue.
height: 3px from the
.font-value-slider::-moz-range-track selector doesn't change anything in the spacing slider.
I'm unable to reproduce that difference in the slider thickness, so this needs a deeper investigation, but not a cause for a P1 bug now.
Do you, by any chance, have a non-HiDPI monitor that may be causing the difference? I have only HiDPI monitors to test with.
Also the spacer is now a bit longer than the other two, but this is present in LTR as well.
That's a slight bug caused by the
font-value-label dimensions used on the letter-spacing as a default keyword. On click on it, or when changing the letter-spacing, it gets replaced with an input + select dropdown which seem to align with the other two for line-height and font-size.
Should I file a new bug for these two issues and CC you?
Yes, please file another bug. No need to CC, it shows up on my radar if it's on the Inspector: Fonts component.