Summary

Adds missing API in the StyledTextModel necessary for toggling of individual paragraph attributes.

Problem

Impossible to turn on or off a single paragraph attribute (or a set of attributes) separately from already existing paragraph attributes.

Solution

Add a missing method

  protected abstract StyledTextModel.applyParagraphStyle(int index, StyleAttributeMap paragraphAttrs);

to complement the existing protected abstract void setParagraphStyle(int index, StyleAttributeMap paragraphAttrs);

Specification

See the attached diff file.