Desktop Entry Specification is missing [ as a reserved character in Exec

[meator]

Hello. The subject says it all. The [ character can have special meaning 
in shells. To quote the dash manpage:

 > A pattern consists of normal characters, which match themselves, and 
meta-characters. The meta-characters are “!”, “*”, “?”, and “[”.  These 
characters lose their special meanings if they are quoted.

I believe that the [ character should be recognized as a "reserved 
character" in the Exec key specification.

Thanks, meator
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