I don't know where or whether it's documented, but it's not new.
Using Space for "clicking" whichever control has focus has been around
for a while.  I don't remember offhand -- it may depend on the setting
in System Preferences that governs whether all controls can get
keyboard focus.
--Andy


On Sat, Sep 8, 2018, at 6:53 PM, Richard Charles wrote:
> I have a simple NSAlert presented as an attached sheet with a single
> default OK button.
>
> When the spacebar is pressed the alert is dismissed.
>
> It this a new thing?
>
> Is this documented anywhere?
>
> --Richard Charles
>
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