swap the case of the selected text
This script allows you to convert the case of a sentence. Did you write a FULL SENTENCE IN ALL CAP. You can no swap the case in one shortcut (shift+F3) same as in word.
You can customize the shortcut by editing the top of the file. See this site for keyCode. You can change how the case is modified (currently swap, upper case, lower case).
It doesn't preserve formating in Gmail. It may have unexpected behavior in textaera. It doesn't stack into the undo history. Change text even if it is not editable
v0.2 : fix for input element
