Before ICE-2150, we used the popupDateFormat attribute to define the DateFormat object for selectInputDate's input text field, which allowed us to use that attribute for the rendered title attribute as well. Since switching to using the DateTimeConverter, there isn't a way of guaranteeing that we can deduce the date format string from the DateTimeConverter, since it doesn't actually expose its DateFormat object, which can be defined from a combination of several attributes, or simply be overridden in a subclass to behave completely differently.

And there's also some user interface and localisation issues, such as how there's a hard-coded English string ("Date Format: ") used in the tooltip, and how the Java style date format string might not actually make sense to a user. They might wonder why "yyyy/MM/dd" has the month capitalised, for example.

So we're going to go with making title a pass-through attribute, that the user can define themself. For backwards compatibility, we'll use this level of precedence:

1. If the title attribute is given, use it

2. If the title attribute is not given, and popupDateFormat is, then we'll set the rendered attribute to the old "Date Format: " + selectInputDate.getPopupDateFormat().

3. If neither is given, then don't specify the title attribute, so that we're not potentially misinforming the user.