[Dialogs] Support multiple non-nested modal backdrops #1327
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This detects if the click occurred on the dialog's owning backdrop. This ensures dialogs that opened previously but aren't nested in the React tree won't close. This fixes bugs related to multiple "unrelated" dialogs that open independently without using any kind of Provider.
Note: non-nested dialogs don't support CSS variables or limiting to only one (topmost) backdrop as that requires context/React tree nesting. I figure that feature is usually useful for closely related dialogs that will be nested in the React tree anyway.
Closes #1320