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Sometimes when performing some actions, focus is permanently lost. That is similar but not the same to bug 540935, and from what i remember it is linux specific. To reproduce: open the console view, press "open console" preferably by keyboard but this may not matter, select anything like stacktrace console... focus is lost. You are not able to regain it unless by clicking by mouse on other focusable item. In particular, you will not be able to regain it with switching views, because most keyboard shortcuts except going to the main menu won't work at all. Well, at least ctrl+f7 for view switching doesn't work and doesn't even display the popup view switcher. Other ways to trigger this: - in the console view, try to close the previously opened console by the close console button, or on a console presenting already terminated program press remove launch, anything that opens or closes consoles in the view will probably trigger this, maybe even the terminate button will even though it doesn't automatically close anything. Also, recently (eclipse 4.9/gtk3), you can trigger exactly the same by just opening any pom.xml with maven pom editor. At least that is what happens to me, symptoms are exactly the same. It didn't happen before, including that if I remember it right it does not happen for gtk2.
We observed the same issue in Linux recently. Whenever we close an editor (programatically or 'by hand') the focus is lost and all keyboard commands are not working anymore until we set the focus with the mouse again to the Eclipse IDE. It is also not enough to switch to another application via [Alt] + [Tab] and then back to the Eclipse IDE, the keyboard commands are still not working unless any UI element is selected by mouse.
