With @mbalfanz's permission, I am removing the auto-increment behavior from the range inputs in the Font Editor.
The feature isn't easily discoverable and when it does work, its user experience isn't good. We never invested time to refine it and we're unlikely to do so. At this point, this is dead code so we should remove it.
What is getting removed is the logic to support the esoteric auto-increment behavior which happens when dragging the range input thumb to the end of the slider and waiting for a while (1000ms). There's needless complexity in handling the concert of events for a little perceived user value.
Users can still type out-of-range values in the text input field for the properties which allow it:
line-height. For these properties' components, there's a new prop,
allowOverflow, which permits values above the
max defined. Other properties are bounded by
max just like before.