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Bugfix: to support multiple menu bars, the callback lambda in dtkWidgetsMenuBarContainer::switchToRoot() must not be static. Otherwise, the same callback for all menubars will only be instantiated once, and it will only capture the container instance of the first menu bar, and it will only work for first menu bar calling this function.

Fixes #68

Bugfix: to support multiple menu bars, we must have a stack per bar, the stack variable can not be shared between all bars.
Fixes #67

The call to dtkWidgetsMenuBar::setFixedHeight() is done by
dtkWidgetsMainWindow::resizeEvent().

It is thus not a **fixed** height we should set, but a normal not-fixed height / size.

(Given the construction of the dtkWidgetsMenuItemFacade, there is no
way for the connection between the facade and its underlying item not
to be achieved.)

block multiple clicks on submenus. Clicking on the back button too early still breaks the slider though

Compatiblity with the new MainWindowButtons: MenuBar needs to be wider, moved below, and closer in the Z dimension.

for correctness when changing workspaces.

before emitting the signal 'left', in the same way as it is done
on line 450.
Otherwise, the callback connected to this signal (lambda at
exp/dtkWidgetsMenu/main.cpp:162) will crash on dereferencing a null pointer.

third party implementations.

Was: due to tracking, move event always occured ...