Si chiama "Terminazione automatica" ed è anche implementato per QuickTime Player e altri. I processi rimangono aperti in background, quindi si riaprono rapidamente, ma con una pressione di memoria sufficiente (ad esempio per altri processi o applicazioni) saranno costretti a terminare.
Per disattivarlo, apri Terminale (in / Applicazioni / Utility o cerca tramite Spotlight) e digita:
defaults write com.apple.Grab NSDisableAutomaticTermination -bool yes
Quindi premi invio .
Assicurati di uscire e riavviare correttamente Grab dopo aver eseguito questo comando di default.
Per ripristinare le impostazioni originali, eseguire il seguente comando:
defaults delete com.apple.Grab NSDisableAutomaticTermination
Dal sito Apple Developers:
Automatic and Sudden Termination of Apps Improve the User Experience
In OS X v10.7 and later, the use of the Quit command to terminate an
app is diminished in favor of more user-centric techniques.
Specifically, Cocoa supports two techniques that make the termination
of an app transparent and fast:
Automatic termination eliminates the need for users to quit an app.
Instead, the system manages app termination transparently behind the
scenes, terminating apps that are not in use to reclaim needed
resources such as memory. Sudden termination allows the system to kill
an app’s process immediately without waiting for it to perform any
final actions. The system uses this technique to improve the speed of
operations such as logging out of, restarting, or shutting down the
computer. Automatic termination and sudden termination are independent
techniques, although both are designed to improve the user experience
of app termination. Although Apple recommends that apps support both,
an app can support one technique and not the other. Apps that support
both techniques can be terminated by the system without the app being
involved at all. On the other hand, if an app supports sudden
termination but not automatic termination, then it must be sent a Quit
event, which it needs to process without displaying any user interface
dialogs.
Automatic termination transfers the job of managing processes from the
user to the system, which is better equipped to handle the job. Users
do not need to manage processes manually anyway. All they really need
is to run apps and have those apps available when they need them.
Automatic termination makes that possible while ensuring that system
performance is not adversely affected.
Apps must opt in to both automatic termination and sudden termination
and implement appropriate support for them. In both cases, the app
must ensure that any user data is saved well before termination can
happen. And because the user does not quit an autoterminable app, such
an app should also save the state of its user interface using the
built-in Cocoa support. Saving and restoring the interface state
provides the user with a sense of continuity between app launches.
For information on how to support for automatic termination in your
app, see Automatic Termination. For information on how to support
sudden termination, see Sudden Termination.
La terminazione automatica e improvvisa delle app migliora l'esperienza utente
