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Version: Mars Release (4.5.0) Build id: 20150621-1200 I have Eclipse Luna on a Win7 laptop, and Mars on a Linux laptop. Otherwise, the Eclipse configurations are very similar (I imported the full settings from the former to the latter). On both boxes, I am set to a particular task, and I have the "Focus on Active Task" toggle pushed in, and specifically in the Package Explorer. I can see several projects that I've looked at recently. On the Win7 box, if I do Alt-click in the Package Explorer, it temporarily shows all projects until I click on something. However, on the Linux box, when I do Alt+click, it seems like it treats it like a plain click on whatever row the mouse cursor was on. The only way I can see projects outside of the current context is to turn off the "Focus on Active Task" toggle. I have existing key bindings using Alt, and those appear to work.
This doesn't work on Linux, but you can click on the [+] icon that appears when you hover on an element to show it's filtered children: https://wiki.eclipse.org/Mylyn/User_Guide#Alt.2BClick_Navigation_.2F_Show_Filtered_Children *** This bug has been marked as a duplicate of bug 116948 ***