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Karim Daher
9dff7f48c5
The Aria menubar examples render each menu in a `cdkConnectedOverlay`,
which detaches the top-most overlay on every Escape keypress
(`disableClose` defaults to `false`). The top-level menus are always
attached, so a detached overlay never reattaches and its `viewChild`
reference becomes `undefined`. Holding Escape detaches the overlays one by
one, permanently breaking menus such as "Insert" and "Format".
Set `cdkConnectedOverlayDisableClose` on the example overlays so the menu
pattern remains the single owner of open/close state, matching the
combobox and toolbar examples. Applied to the basic, disabled, and rtl
menubar examples (and their material/retro variants).
(cherry picked from commit db2101c994)