This is a followup report for bug 71556 ("Accessible text-attributes-changed signals should only be emitted when the text attributes have changed [a11y]").
The majority of the issues is gone with Jacobo's fix, but there's still a small remaining issue:
"After the patch, most of the unwanted text-attributes-changed events are now gone. Still, the event shows up when you type the first letter of a new paragraph." 
The fix for the majority of bug 71556 for reference:
"fdo#71556: Remove unwanted a11y event on text insertion"