in the course of writing, when trying to turn off italic formatting, either
through the keyboard shortcut or the menu bar button, the option refuses to
disengage. user is forced to turn on italics through selection of a certain
portion of text.

replication:
1. begin writing a sentence, then turn on italics.
2. after typing a few characters, use the keyboard shortcut to return to normal
formatting (ctrl+i), or use the menu bar button to try to turn off italics.
3. the writer will refuse to disengage.

i have noticed that this case only holds true if the previous character in
typing is italic. for example, highlighting the second to last character in a
sentence, placing the cursor just after it, and trying to turn off italics will
produce the same result.