TextOffsetAt
int32 TextOffsetAt(float x, float y,
textOffset += info.layout->TextOffsetAt(x, y - info.y, rightOfCenter);
int32 TextOffsetAt(float x, float y,
int32 offset = fTextDocumentLayout.TextOffsetAt(where.x, where.y, unused);
int32 offset = fTextDocumentLayout.TextOffsetAt(where.x, where.y, unused);
int32 caretOffset = fLayout->TextOffsetAt(location.x, location.y,
int32 textOffset = fLayout->TextOffsetAt(fCaretAnchorX, (y1 + y2) / 2,