Use "Lowercase and Uppercase" for all letters in word
Setting the Capitalize Word key will change the first letter of the word to capital. If you want to change all letters in a selection to capitals or lowers, then set a couple of keys for the Uppercase Word and Lowercase Word choices in Text Key Bindings.
i.e., Go into xcode preferences -> KeyBindings ->Text Key Bindings -> Uppercase Word -> assign a key
and
Go into xcode preferences -> KeyBindings ->Text Key Bindings -> Lowercase Word -> assign a different key
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