Fix Modal Dialogs to be top-most
Fix Modal Dialogs to be top-most

...even when multiple other dialogs are open

Dialogs are created with up counting z-index. They start with 9999 and
quickly reaches 10001.  Modal Dialog are always on z-index 10001 and so
interference with these if more the 2 dialogs are open.

By lowering initial z-index you can create much more dialogs and still
have modal dialogs on top.

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