se-edu / addressbook-level4 / 4281

94%

Pull #850

travis-ci

MainWindow: focus on helpWindow if already open

MainWindow keeps only a single HelpWindow instance, and calls
HelpWindow#show() on it whenever we want to open it.

If the HelpWindow is already open, HelpWindow#show() does not focus
on the already open window, which can be confusing to users since a
help window does not appear.

Let's update MainWindow to focus on helpWindow if already open.
Let's also add helper methods in HelpWindow to check if the help window
is open and to focus on it.

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