A string with pairs of characters. When the user types the character in an even-numbered position, it automatically inserts the following character after the cursor (without moving the cursor). The inserted character will be automatically overstriken if the user types it again.
The default is return null, which disables the feature.
Added January 25, 2021 (version 9.2)
Enables automatic closing of brackets like (, {, and [ when the user types. Specifically, you subclass and return a string of the completions you want to do, so for that set, return "()[]{}"