[BLUEJ-1357] Context menus in class diagram do not receive keyboard focus without mouseover

If you trigger the context menu in the class diagram, there is no way to get keyboard focus on the menu without moving your mouse over the menu.

It seems like usually in JavaFX (e.g. codepad) the menu gets focus if you press up/down, but we use these keypresses to move around the class diagram, so that isn't happening.

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Issue metadata

• Issue type: Bug
• Priority: Medium
• Fix versions: 5.0.3