Set focus on Automation Editor editor instead of window.

[ghost]

Set focus on Automation Editor editor instead of window so keyPressEvent's can be processed. This makes shortcuts work without manually have to click somewhere in the grey area of the editor itself.

[ghost]

@PhysSong, what about moving keyPressEvent to AutomationEditorWindow? Even with this change when the editor has focus and you click the window title it loses focus and thus still doesn't process keyPressEvent's.

[PhysSong]

It seems like PianoRollWindow::focusInEvent() gives the focus to its editor as well. We may add something like this to AutomationEditorWindow or even Editor.

[ghost]

Yes that did it! It now always processes the Editor it's keyPressEvent's :-)