pub fn split_runs_at(
runs: &[FormatRun],
byte_offset: u32,
) -> (Vec<FormatRun>, Vec<FormatRun>)Expand description
Split a block’s format runs at byte_offset. The returned right-hand
vector has its run offsets re-based so they start at byte 0 of the
new (right) block. Straddling runs are split with their format
cloned to both halves.