Add nullOnKeyRelease option #18
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This pull requests adds the option
nullOnKeyReleasetokeysInputandaddKeys. If this option is set, the Shiny input will be set toNULLafter any of the bound keys is released.This option enables to detect whether a key is pressed. Consider an actionButton whose action depends on whether
ctrlis pressed or not. Without this option, the Shiny input is"ctrl"as long asctrlhas been pressed any time in the past. With this option, the Shiny input is only"ctrl"ifctrlis still pressed and elseNULL.