placeholder for contact photo shows wrong character in contact list

[j-ed]

Expected behavior

If you've decided to sort your contact list based on the first or last name, the character used
as placeholder for a contact photo, should always be the first character of a displayed name:

• Sort by first name -> FIRST LAST -> "F"
• Sort by last name -> LAST, FIRST -> "L"
• Sort by display name -> SALUTATION FIRST LAST -> "S"

Current behavior

Independently which sort order of your contact list you've chosen the placeholder for a contact photo always contains the first character of the display name. For your information, in the following example the salutation "Herr" is used therefore the character "H" is displayed although last name sorting has been selected. Instead I would have expect to get an "A" displayed because all last names are starting with an "A":

Steps to reproduce

1. Open the Contacts app
2. Switch between the available sort orders and check how the contact names and the placeholders are displayed.

Environment

Server Configuration

OS: Linux 3.16.50
Web server: Apache2 2.4.37
Database: MariaDB 10.2.19
PHP version: 7.2.13
Nextcloud version: 15.0.0
Contacts app version: 3.0.1

Client Configuration

Browser: Mozilla Firefox 64.0
Operating system: Windows 10

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[nextcloud-bot]

GitMate.io thinks possibly related issues are #581 (Contact photos dont show up until you click on the contact), #245 (Contact list sorting), #215 (Contact Pictures don´t show up), #782 (Contacts app only listing All contacts), and #312 (Large contact photo preview).