Alt + left mouse selects all in outline view

In Outline view, with the ‘Include in Compile’ checkbox visible…
I select a couple of documents, using ctrl + left mouse. They are highlighted.
I click on the check box using Alt + left mouse.
The check box on all the documents is set, not just the ones I have selected. Is this the correct behaviour?

Currently Alt+click alters all the visible documents, but I’ve filed a ticket to address only altering the selected documents when a selection exists.