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KHamburgerMenu: Reset when menu bar contents change

Felix Ernst requested to merge felixernst/kconfigwidgets:hamburger_react_to_menubar_action_changes into master

Prior to this change changes to the top-level actions of the menu bar were not immediately reflected in the contents of the hamburger menu. This was an oversight based on the idea that menu bars tend to not change a lot while an application is running.

With this change the menu bar set through setMenuBar() will now be monitored for changes to its top-level actions and if changes occur, KHamburgerMenu will be notified that it needs to update its contents.

Background information: KHamburgerMenu only updates its contents when that is necessary. This commit fixes one case that was missed why an update might be needed.

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