Why is canCheckForUpdates enabled while sessionInProgress is also enabled?

[pilotmoon]

According to the docs, canCheckForUpdates is the property against which the enabled state of a "Check Now" command might be validated. The docs also state that "an update check can be made by the user when an update session isn't in progress".

Sparkle/Sparkle/SPUUpdater.h

Lines 153 to 156 in 997778d

	An update check can be made by the user when an update session isn't in progress, or when an update or its progress is being shown to the user.
	A user cannot check for updates when data (such as the feed or an update) is still being downloaded automatically in the background.
	This property is suitable to use for menu item validation for seeing if `-checkForUpdates` can be invoked.

However, Sparkle is setting canCheckForUpdates=YES even while sessionInProgress=YES.

Example:

Sparkle/Sparkle/SPUUpdater.m

Lines 423 to 424 in 997778d

	[self setSessionInProgress:YES];
	[self setCanCheckForUpdates:YES];

Is this a Sparkle bug, or am I misunderstanding the intended behaviour?