Fix combobox can't open dropdown when the editable textbox of it has the focus #1114
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The code has detected the SelectedItem is not null, and I think it's better to detect container is not null too. Especially when the ComboBox dropdown is never open.
If the given target of the
Keyboard.Focusmethod is null, the keyboard will focus to the RootVisual like MainWindow. It causes the keyboard focus changes if the keyboard has been already focused on it. But in .NET WPF code, when the IsKeyboardFocusWithin changed, it may cause the dropdown closed immediately.