const CharacterIndex lastRunIndex = run.characterRun.characterIndex + run.characterRun.numberOfCharacters - 1u;
if( lastRunIndex < index )
const CharacterIndex lastRunIndex = run.characterRun.characterIndex + run.characterRun.numberOfCharacters - 1u;
if( lastRunIndex < index )
// Update the number of characters of the style run.
if( ( 0u == index ) && ( 0u == run.characterRun.characterIndex ) )
// Update the number of characters of the style run.
if( ( 0u == index ) && ( 0u == run.characterRun.characterIndex ) )