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	when modal window is active. (Bug #2152)
	(applicationShouldTerminate:): Remove now-unneeded while loop
	around NSRunAlertPanel.

	* nsmenu.m (popupSession): New file-global variable.
	(pop_down_menu): End the popupSession before closing dialog.
	(ns_popup_dialog): BLOCK_INPUT around dialog presentation.
	(EmacsDialogPanel-runDialogAt:): Don't place window (superfluous),
	don't query NSApp for events (just sleep instead).