Bug 97523 [Import/Export] Get overwrite prompt before no resources selected prompt
3.1 RC1 - File > Export > Archive - clear any selected resources - enter an archive file name where the file already exists - Finish - it prompts to overwrite the file; choose Yes - it says "There are no resources currently selected for export" (OK) Should get the "no resources" prompt first, and not bother with the second one. Should check the other export wizards too.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/wizards/datatransfer/WizardArchiveFileResourceExportPage1.java
* @see org.eclipse.ui.wizards.datatransfer.WizardFileSystemResourceExportPage1#destinationEmptyMessage()
     */
    protected String destinationEmptyMessage() {
        return DataTransferMessages.ArchiveExport_destinationEmpty;
    }
    
    /**
     *	Answer a boolean indicating whether the receivers destination specification
     *	widgets currently all contain valid values.
     */
    protected boolean validateDestinationGroup() {
    	String destinationValue = getDestinationValue();
    	if (destinationValue.endsWith(".tar")) { 
    		compressContentsCheckbox.setSelection(false);
    		targzFormatButton.setSelection(true);
    		zipFormatButton.setSelection(false);
    	} else if (destinationValue.endsWith(".tar.gz") 
				|| destinationValue.endsWith(".tgz")) { 
    		compressContentsCheckbox.setSelection(true);
    		targzFormatButton.setSelection(true);
    		zipFormatButton.setSelection(false);
    	} else if (destinationValue.endsWith(".zip")) { 
    		zipFormatButton.setSelection(true);
    		targzFormatButton.setSelection(false);
    	}
    	
    	return super.validateDestinationGroup();
    }
}