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Yee Cheng Chin f6ba7dd40b Fix bad interaction with never opening window + terminate on last window

Previously, if you configure MacVim to never open an untitled window on
launch, *and* terminate MacVim on last window closing, you could get an
odd behavior where MacVim will close itself soon after launch, usually
when you fiddle with "About MacVim" or the preference pane. This isn't
too big a deal but could potentially make it hard to change the
preference back, and it's hard to know if a future macOS update will
further break this behavior causing MacVim to keep terminating itself on
launch (the termination behavior relies on the
`applicationShouldTerminateAfterLastWindowClosed` API which is
controlled by the OS).

To fix this, simply make it so that the preference pane doesn't allow
both settings to be set at once. If the user is trying to do so, set the
other setting to be something sane. Also, in the
`applicationShouldTerminateAfterLastWindowClosed` behavior, make sure we
add additional protection so that it will not return true when we are
set to never open untitled window (this should only be the case if the
user manually set it using `defaults` because we are now already
protecting against this in the preference pane logic). This should be
fine because these two setting don't really make sense for the user
anyway. It doesn't seem to make a lot of sense for the user to want this
behavior.

Note that I'm doing manual checking in preference UI instead of using
some sort of key-value listening of NSUserDefaults because I'm afraid of
some unintentional infinite recursion going on where the settings keep
setting each other back and forth. By only doing this at preference pane
changes this should not happen.

Fix #1257

2022-08-04 00:16:15 -07:00