get
Returns the unique kerning values across the grapheme range.
Parameters
block
the text block whose kerning values should be returned.
from
the start index of the grapheme range. Negative falls back to the current cursor/selection start when editing, or the start of the entire text otherwise.
to
the grapheme index after the last grapheme. Negative falls back to the current cursor/selection end when editing, or the end of the entire text otherwise.