Contact search doesn't support Chinese

As reported in https://lists.ubuntu.com/archives/ubuntu-devel-discuss/2015-April/015449.html there is the same problem with Cyrilic alphabet. Maybe it happens with all characters that aren't in latin alphabet?

Status changed to 'Confirmed' because the bug affects multiple users.

Critical issue, I think, also reproducible fro Russian language.

Status changed to 'Confirmed' because the bug affects multiple users.

Some name examples to test:

Роман Щекин
Дмитрий Ященко
Фёдор Емельяненко
Владимир Путин

@renato per mailing list:

https://bazaar.launchpad.net/~ubuntu-branches/ubuntu/wily/address-book-app/wily/view/head:/src/imports/Ubuntu/Contacts/ContactListModel.qml

The looks a bit suspicious:

    var containsLetter = /^[a-zA-Z]/.test(value)

I suspect the rest of the onValueChanged handler is mistaken too:

                if (containsLetter && (filters.length > 1)) {
                    filters = [filters[0]]
                } else if (!containsLetter) {
                    filters = [filters[0], phoneNumberFilter]
                }

If I understand it correctly, that's assuming a token that doesn't contain a letter must be part of a phone number, which isn't true. For example, in London, The Bar With No Name is also known as 69 Colebrooke Row because that is its address. But if I add a contact with that name and address, and then search for "69", I get no results, presumably because the address book is looking for "69" only in the phone number and not finding it.

If it is legitimate to be using a containsLetter here, though, I think it needs to be a function that calls isLetter() on each character of the string, stopping and returning true if any of those calls return true. isLetter() does the right thing by checking whether the character is in *any* of the Unicode Letter- categories, not just [a-zA-Z]. <http://doc.qt.io/qt-5/qchar.html#isLetter> Unfortunately there doesn't seem to be any equivalent element for this in QRegExp.

Marking critical for china launch

This bug was fixed in the package address-book-app - 0.2+15.10.20150629-0ubuntu1

---------------
address-book-app (0.2+15.10.20150629-0ubuntu1) wily; urgency=medium

  [ CI Train Bot ]
  * Resync trunk.

  [ Renato Araujo Oliveira Filho ]
  * Fixed search by non-latin names. (LP: #1421245)

 -- CI Train Bot <email address hidden> Mon, 29 Jun 2015 18:09:22 +0000

I also test contact search with Simplified Chinese, it works for me.