Fixes broken input of modifier characters on MacOSX. #26
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Fixes #25 by checking if the character next to the caret is one of MacOS X supported modifier characters. If this is the case the checker isn't run.
It also does not check if such a character is copy/pasted. However this has no negative effect as the checker will run again when the next character is input.
The modifiers are exhaustive according to http://guides.macrumors.com/Typing_with_extended_characters. If more are added they can easily be added to the
modifierCharacters
array.Further discussion
I would have preferred a solution where the special input state (OS is waiting for the second character) is detected but haven't found a way. For a Chrome Extension it looks like a normal character has been entered.