public TextLayoutBuilder setTextSpacingExtra(float spacingExtra) {
    if (mParams.lineHeight == DEFAULT_LINE_HEIGHT && mParams.spacingAdd != spacingExtra) {
      mParams.spacingAdd = spacingExtra;
      mSavedLayout = null;
    }
    return this;
  }
Sets the text extra spacing for the layout. Extra spacing will be ignored if {@link
TextLayoutBuilder#setLineHeight(float)} was used to set an explicit line height.

@param spacingExtra the extra space that is added to the height of each line
@return This {@link TextLayoutBuilder} instance
library/src/main/java/com/facebook/fbui/textlayoutbuilder/TextLayoutBuilder.java