17207: Alt+F4 to close a dialog should not activate the top menu

[krasko78]

Resolves: #17207

The main menu is activated on the release of the Alt key when m_needActivateHighlight is true. m_needActivateHighlight should become true only when the Alt key is previously pressed alone and not in any other case. On the other hand, it should be set to false as soon as a menu is highlighted, navigation started, another key is pressed and when the menu is closed.

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